454 mpg build Custom optics, including automatic focus and filter 454 based build advice. 10-13 mpg seems about right for a 4x4 lifted 454 Suburban with an honest driver. 200,000 miles, did a full tuneup 2 years ago when I bought it, and put a Jegs 3" into a pair of 2. 454 Big-Block Budget Engine Build - Making Cents. painless wiring harness Here's my build 73 289 casting 454 block (std bore) 396/427 steel crank (was used, just polished, tolerances on the loose side) Used std bore L2268 forged CC 11-1's, pin fit pin to pistons (this is the key to high RPM abuse) Thumb rods with ARP wave locks (supposed to recon when changing bolts but I didn't, they're still untouched less the bolts. 5mpg. Buick built the 455 V8 for only seven model years from 1970–1976. Max HP not a concern. At same time I will get rid of that crappy TBI setup and change to a full sequentiell EFI using Vortec parts, distributorless ignition with coils and PCM from a LS1 which I can easily programm myself to my liking. Send Private Topic View Profile. 02. 5L V8 DIESEL Automatic 4 Speed Added Jun 2017 • 3 Fuel-ups. 030 over) but I think it is still only stock 230 horsepower. unless you are concerned about gas mileage, but I am assuming since we are talking big block already that isn't much of a concern. com: User Name Looking for ideas and doing some research on the big block since I'm much more familiar with diesels Engine is a 1995 454 TBI all stock. Mine used a truck block and 4. com or GMFS as 454SSGuy, this is the same build. Its main components are: Temperature-controlled sample reservoir. Anyone 454 (budget) build. But, that's a distraction from the question at hand- given the budget constraints, the first 2 posts hit the nail on the head. 1999 posts · Run in naturally aspirated trim, the 454 produced 510 hp at 5,800 rpm and 488 lb-ft of torque at 5,200 rpm. 10 rear gear. With your cam advice, his mileage should be better than 10--I was getting close to 20mpg (XE256) with my conservative setup. Go. Increasing the gas mileage without sacrificing performance on the vehicle only requires inexpensive and simple changes to the engine. So you ought be very good to go. Building on the popularity of its 427-cubic-inch engine, General Motors introduced the Researching the mpg of older factory carbureted versions of this MH could provide some clues Our '94 Flair with tbi was still running good at 70k and getting 7. that cam would have worked I have a 454 block that I'm rebuilding for my 68 and need some help figuring out which way to go with it. HOT ROD Staff Writer May 26, 2011. I also had a vacuum gauge mounted in the dash and I drove by that. When it comes to fuel efficiency, the 350 Chevy is a better option, as it offers 38 mpg. Basically, the engine combines eight cylinders and a larger bore, which accounts for an average of 10-15 mpg. but even with the modifications, the 8100 Vortec didn’t get better fuel economy than its predecessor. 040. Woohoo!! Rick & Victoria Crow's 454 Big Block 1970 Chevy Chevelle SS is one immaculate Pro Street build. Most of my driving is at high altitude (5000+ feet. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright It sounds like you need to build two different engines. it has 150,000 and several looming issues (likely head gasket, leaking injectors, and early signs of rod trouble). 7 to 98 cc sized true closed chamber heads, along with a 210/210 cam, said headers and such and go. I dont like to push it but it will do 85 mph with out the trailer. Darren Trudeau Discussion starter. It's not the best when it comes to fuel economy, but it does get decent Michael Rasmussen; Massaprqua, NY: I have a 454 big-block from a Chevy truck in my Chevelle. I am open to your FORCED INDUCTION - 454 SS Single Turbo build - How's it goin, my name is Trey and this is my build. I've been trying to figure out what to do with it since then. again. Thats what makes good mileage offroad. 31s or 3. 75:1 cr, 400TH, 2200 stall, gets 9 mpg city and 12 mpg highway. 13. There is also the consideration of a overdrive transmission swap. and fuel economy. Both are great cars to drive and it is a tough debate. Re: ideas to increase mpg for 454 in motorhome 09-17-04 02:55 PM - Post# 513911 In response to 427-57 You might also want to CK some of the Motor Home sites either by brand or by class, such as Class A, C ect ect. 005; 10. Good advice, Broc. 90 and older is particularly bad and that is largely due to NO OVERDRIVE. "I want something that really rocks. Its a 28 foot p30 chassis 454 tbi with a OD trans looks like a 4l80 that has been rebuilt. The 468 engine. 1 2 of 4 Go to page. I think that on a stock 454 block going 3/8" stroke and . 88 valves. Read the full story here: http://bit. 94 k2500 454 gas mileage. Been there done that. If your wanting to build 600hp you don't need to worry about gas mileage. Joined: Dec 8, 2001 Messages: A build dear to my heart. 31 rear gear. You'll loose less sleep! I plan on keeping my car forever so the overdrive unit was justified paying a large lump of $$$ for gas mileage and extended engine life. The money that is going to cost you will buy a LOT of gas at 8 MPG so how much do you actually drive and will you drive enough to earn back that money at the extra 2--3 MPG BUTTTT if your going to build a big bigblock. HorsepowerAddiction Discussion starter. " It gets 9 mpg loaded or empty". Give up all hope of decent MPG unless you go OD trans and EFI. 2 :1, 2. Compression 10. Hi all, I have just aquired a suburban with a 454. 460 vs 454 Mpg. J. ) but you would lose a lot of low end towing power. My tranny guy says it will be able to handle the big block torque. Thread starter Amsterdamned96; Start date May 14, 2022; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. The suggestions you gave, is how I'd build a mild 454 motor. Join. what RPM should I be targetting to cruise at when I build the motor? I want the peak torque farily low so I can cruise at 65 mph or so without screaming the engine. So maybe not a deal killer, I'm getting ready to rebuild this 454/7. 5 MPG when I put small diameter long tube headers on and another 1 MPG when I then when from dual 2" exhaust to 2. The engine seems to like to be run aggressively. 1970 SS LS-5/M-22 El Camino- Org. 65@125mph 406 Now you're at $350-$400. But its paid for and has 79000 miles. 1 post · Joined 2023 Add 454 MPG in 3/4 ton The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board. The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain: 1984 454 build for towing Web 67-72chevytrucks. 50/gallon gas. Don't overthink it on cam choices, there are many that will get you Using this package, a 35,000-mile RV take-out low-compression 454 stocker made 560 hp and 530 lb-ft on Westech Performance's engine dyno, a gain of 225 hp and 45 lb-ft I have a 454 block that I'm rebuilding for my 68 and need some help figuring out which way to go with it. My combo is very mild but is a 454 . Dougs 2" headers with 3" exhaust. Jump to Latest and gets 13. 15/1. 10 axle. arncejoshua. 1-3/4" Hedman Camaro headers, and a Comp 268 cam. 454 Chevy engine. 1993 K-2500 Suburban Silverado, 7. The Im trying to decide on what chevelle to get. 5 mpg, which I thought was poor after having a diesel TC that got 21-23 empty, 15-16 loaded, and 1-2 mpg less towing while loaded. JohnWick Discussion starter. The 454 has a lower gas mileage rating and higher durability. For sure my best mileage came when I traveled about 55 MPH People tend to exaggerate fuel economy at both ends of the spectrum. Long highway drives will yield 14-15 mpg. Save Share Reply Quote Like. 5 mpg and 8 when he was pulling his 1/2 ton Chevy. 10s to 3. 45-65% HP Increase; BUILD & PRICE . 270win Discussion starter. 6 posts · Joined 2009 Add to quote; Only show this user #1 · Apr 4, 2009. I got 6 mpg pulling a loaded trailer 70+ this past weekend, and decided it was time to think about getting better. A few years ago my dad swapped in a 5-speed stick (after going through 3 transmissions in less than 75,000 miles). 613/. If you click them and make a purchase, we may earn a small commission. I think when you are hauling around an extra 1000 lbs. 08 LSD, 258HR roller cam, 8. You need to feed the beast. - Is the car daily transportation or a toy? SB for daily, BB for toy. Start with a a 502 or aftermarket block. I feel it cruises @ 60 -65 mph getting 11 mpg . down low. The idea behind the truck is a DD/AutoX toy. 1 Avg MPG. I'd be happy with Stage 1 Buick 455 V8 (Credit: Mopar89/Wikimedia) Buick 455 V8 Basics. The Chevy 427 was rated at 300 horsepower, while the 454 had 375 horsepower. Say 70% street and 30% strip. 1019 posts of the pants" as if it had larger The truck is finally done! Watch me finish up the final loose ends of our budget gmt400 build. Build a 700hp 454 LS stroker that's tame enough for your daily driver. 6 mpg on mostly straight two-lane highway with 35mph town drive-throughs. Reactions: BigBlockGuy454. Chevy 454 vs 350: Fuel economy. 8 mpg @ 60 towing my 240D. I swapped in a 454 and mpg drop from 10-11 to 7-8 in the city, and 16-17 to 13-12 on the highway. ) I think the best mpg improvement would be a more open rear axle ratio (3:23, 3:73, etc. Electronics Guide. Unfortunately, the larger amount of power that comes with the 454 is reflected in the fuel economy and as you would expect, this means the combination of a larger bore and eight In the case of the 454 , how about a mild build in the terms of tbi 454s? Besides, diesels does have faults themselves. It also 350 /454 mpg differences The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. It was a solid 6 mpg from the day it was bought new. 444@105. The 990 heads have big Mine is a stock 454 and my uncle swears that he was getting 7. 08 gears, and 200R-4 overdrive. FYI, My 454 in a 1970 chevy C10 LWB with 3. 73:1 rear gear and a muncie 4 speed transmission is whats used most commonly, with about 27-29" tires depending on the car and clearances. 25-8. 2 hwy with cruise set at 65mph on a non windy day and pretty much flat driving. Make sure your tires are properly inflated – underinflated tires can decrease fuel economy by up to 3%. Meet the Transformer: 454 Bio’s One Pot sequencing instrument. It should be done this week and Straub Re: 350 mpg vs 454 mpg in stock form my 454 gets 12hyway and 14 town driving. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: 350 /454 mpg differences 350 /454 mpg differences The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. Build advice 454 BBC - AFR 265s? Jump to Latest 21 - 35 of 35 Posts. The first rebuild was using an Eagle forged crank 4. So, I am starting over and need to ask "real" world experts for advice, after realizing my original combination was less than ideal due to the relatively high compression (9. It’s our latest Engine of the Week. A. I own both a 454 Chevelle and a 383 El Camino. Production of the engine began in 1970 in the Corvette Stingray. It has a displacement of 454 cubic inches and produces 425 horsepower at i am in the search now for a 454 BBC for my 1950 GMC dually. 4L build. Either way, the parts should be fairly close. Increases cruise fuel economy with prop change; No need for engine modifications with M-1 or M-3 systems; Intercooled M-3 Procharger System. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: 350 /454 mpg differences After much debating I am deciding to build a 454 instead of buying a crate ZZ502. 6 MPG and when I ran the foothills in Missouri I was at 10. 73 gears and 31 inch tires. I have a 2000 OBS Chevy quad cab with a 454 Vortec. As a way of reminiscing, we’re going to give you a glimpse at the 2017 Sunnen Charity Engine Sweepstakes build – a 454 cubic inch ProCharged LSX engine done by Patterson-Elite Performance. 0L and a 4L80E for probably $3-4K - Are you building a car that will do everything well like turning, stopping, driveability, gas mileage, ect? If yes to this I would say SB. Was doing 60 Tbi 454 mpgIs this as good as it gets? Thread starter whiteboyslo; Start date Feb 17, 2018; Update on my truck build as per your requests. Original skin/int. You might have better luck finding a Mark IV BBC 454 out of a motor home as most of them are pretty low mile and the people that owned them took car of the 454's. the ls swap itself will cost more than just dropping in the 454. Save Share They can be made to make more power and better fuel economy. Not great, but not bad considering the haul. My brick got 8+ mpg with a well tuned Q-jet. The 454 Chevrolet is a big block engine. Here Your gas mileage is a factor of your weight, the break-specific fuel consumption (BSFC) of your engine, and the load on the engine (gears, speed, wind resistance) etc. 5" dual exhaust. My trans is a built T700R4. I like to travel to shows in other states so economy Only way to significantly increase economy (decrease fuel consumption) of the engine would be to increase compression ratio or increase **MEP which is done by changing pistons, different **camshaft profile, and You'd be surprised at how much power you can actually make with a mild build from a 454, as long as you don't get into "race mode thinking" and start buying parts you shouldn't. Uncensored vehicle news. Despite its introduction in 1970 the basic design lived on in production cars and trucks through the early 2000’s. 002 and . Jump to Latest 62K views 93 replies 17 participants last post by TY70SS Dec 23, 2008. It had a gooseneck hitch in it from day one and was used as a truck should be. Crane and Crower used to offer max efficiency/mpg cams but when you really look they are not far from stock as far as lsa, IVC, overlap etc. 50 will be max for boost. 5- 14 is Realistically,forget about gas mileage with a 500 HP 454 in a 4000 lb. Still, they stuck the massive 7. In contrast, the chevy 454 engine runs an average of 10 to 15 miles per gallon. 08's), same truck. 5 trw pistons 2 bolt main with oval port head's open champers 049 1. GAS MILEAGE. So I search though threads, posts, and articles looking for statements by cam gurus like Mike Following shows the average MPG of each of the 11 vehicles in the system. Personally I wouldn't even consider the 454. roller . daniel17319. use a The engine runs an average of 10 to 15 mpg. 2-5 mpg in some cases. Made 450 @ 4200 600 @ 300. Building a 700 HP 454 Engine: A Comprehensive Guide If you’re looking to build a high-performance 700 hp 454 engine, you’re in the right place! This post aims to break down The larger power produced by the 454 engine is reflected in the fuel economy of the engine. 2 L, 4 X 4, Laredo 2005 Dodge Dakota, 4. Can's say I am disappointed at all with my 2 sets I have run, with little to no compression. 9. Mostly 65mph driving. 5 to 1 compression, highly massaged Edlebrock Aluminum Oval Ports with matched RPM Performer intake, R-280 Heck, buy an old farm truck 454 engine and add a pair of old -206, 96. 310 bore boosted unless you can find a GenVI 502 block and then, 4. :thumbsup: Consider a mild engine for $2000/2500 and the rest for a new 12-bolt diff with perf gears, traction goodies, and some drag radials vs making a stout engine that you'll My 454/Th400 in a stock height C20 with stock size tires COULD GET 13. I haven't checked it myself yet, but I think he said it's up to around 8 or 9 mpg now. 500 arm x 4. 1984 454 build for towing Engine & Drivetrain. I'd be happy with 10 so what re the most obvious things tho change/upgrade. 43---3. TWIN TURBO GEN 6 454-STOCK SHORT BLOCK. 5 mpg, which I Increasing MPG - 1994 P30 454 Getting around 6 mpg in a 25 foot Itasca Passage (1995) and want to improve this as others in the Uk are getting double this. It was in a 5500 pound truck with sm465, 3. City, highway, wheeling, etc. The engine has a mild cam and a Rebuilt Q-Jet from Auto Zone. After reading some of the suggestions here, the easiest suggestion seemed to be to to adjust the parking brake. 060" 9. Cubic inches RULE and the larger bore of the 454 will allow whatever heads you bolt onto the block to breathe better because they won't be as shrouded as they would with the smaller 402 bore. As to valves, you're better off with some very mild port work, a quality dual plane intake, and proper cam. Which cam should be better for MPG? Gen 6 Vortec 454. My '88 cc dually came factory with a 454/TH400 and 4. The L29 454 was originally rated at 290 hp and 440 lb-ft of torque thanks to a combination of fuel injection, large oval-port heads (to replace the peanut ports used in the 454 Build and Dyno Results (600+ HP!) Jump to Latest 21 - 40 of 72 Posts. 5" catback on it last summer. We take a junkyard 454 short-block, and without taking it apart, bolt on a new top end and other parts to make 700 hp for less than $2,500. As I was building my 70 Wagon ,,I had a plan to build a driver,(not a racer) for the long haul. So I am looking for the best highway mileage and torque with this build. ha ha Increasing MPG - 1994 P30 454 Getting around 6 mpg in a 25 foot Itasca Passage (1995) and want to improve this as others in the Uk are getting double this. 88 valves,Comp HR cam 289/295 234/240 . buddy's thinking about getting rid of his 60 over 454 rotating assy. It is a good reliable motor, lots of power, but 454 SBC Build. On the highway running 70 mph (cruise set), I get 12 mpg in 4 high and 15 mpg in 2 high with my 95 GMC Z-71, 350, EFI, automatic, extended cab. 4L V8 GAS Automatic 4 Speed Extended Cab Pickup Added Mar 2023 • 21 Fuel-ups. 454 Volvo V40s have provided 6. 07s wouldnt be just My old TBI 454 ran amazing! All I did to it was run headers and AFI (Affordable Fuel Injection) harness and chip. 11 posts · Joined 2021 Add to need some ideas with a low budget 454 build. The Combination of a larger bore and tourqe monster 454 build. 10 gears. 7L V8 GAS Automatic 4 Speed Added May 2024 • 8 Fuel-ups. 11 and only got 8 mpg running empty or towing 9500# 5er), and 3. Can anyone tell me if this would be worth getting for this build up? It will come complete with everything except the accessories, intake and Carb/EFI. daniel17319; Oct 17, 2024; Engine Performance + Maintenance; Replies 2 Views 292. 278 posts · Now you're at $350-$400. I try not to drive the old Burb unless I really need it, but I admittedly take it out on the weekends sometimes just for fun. 55 posi 12-bolt. 1 2. :yes: I'm thinking the best bang for your buck is an entire system upgrade. must be somthing wrong with it lol '72 k10 lwb 454, th400, 205, d44ft, 12b rear, 4in skyjacker, 35x12. If you plan to keep it, consider upgrading it with TBI (throttle body) or MPI (multi-point) fuel injection. 73s might negatively impact hill-climbing performance despite having that huge engine. Curious on upgrades for it with the main operating rpm range being idle-3200 without destroying the fuel economy which is currently 10mpg empty, not sure towing yet but goal of 8mpg pulling 10k camper trailer. 2K views 27 replies 13 participants last post by HorsepowerAddiction Nov 13, 2012. Seems I have always gotten 6 MPG, speed not changing much. 454 budget build thread. 614 lift and 242/252 duration. Build it as big and strong as you can or you'll get tired of getting your A 396 built with only 325 hp & Qjet carb would be great for gas mileage ! 67 Chevelle Malibu SS Cdn Born 283 / PG / A51 468/TH400 2,500 stall / S60 3. 00 stroke, Eagle I-beam rods and Keith Black #203 hypereutectic alloy, . 125" over, but to be sure, I would sonic As a way of reminiscing, we’re going to give you a glimpse at the 2017 Sunnen Charity Engine Sweepstakes build – a 454 cubic inch ProCharged LSX engine done by History. Just a mild build but it should be a neat little cruiser The Chevrolet "big-block" engine is a term for a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines; that were developed and produced by Michael Rasmussen; Massaprqua, NY: I have a 454 big-block from a Chevy truck in my Chevelle. 70 rocker arms Holly Street dominator intake, Holley 850 carburetor I have to run vp 114 octane looking for a build 500 to 550 HP that doesn't require using 114 octane It's a street driven car with 3000 stall and 411 The Chevy 427 and the Chevy 454 are both American muscle cars. 50s, and I got around 15-16 mpg OVERALL. Hell even 6 speeds are going away with more modern 8 speeds. The engine produced 255 to 290 horsepower. 1(LPG fuel), Long tube headers, RPM air gap manifold , Stock heads cleaned up a bit - otherwise stock. fitting either brodix race rite oval port or afr aluminum heads with stock port locations. so imo thats a good way to save money at the pump. maybe I need an off-road trailer Alot of variables at play when your talking off road mpg vs on road. The engine will be going into a full weight 1970 Chevelle with a TKO600 and 3. Lots of MUSTANGS and such to intimidate. 5 Kawasaki EN450A 454 LTDs have provided 16 thousand miles of real world fuel economy & MPG data. You're not going to build a very successful na engine that will be boost friendly, and you're not going to build a boost friendly engine and be very successful na. S. Property of RckMtnMic . Kawasaki EN450A 454 LTD MPG. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: 350 /454 mpg differences The larger power produced by the 454 engine is reflected in the fuel economy of the engine. I THINK I want a diesel until I look at the My RV is all stock with 100k miles. Engine is going to 67 Impala with TH475 and 3. 2019; 27. Nothing is going to help that fuel FULL BOOSTED RESULTS. Empty it is much better. I'm looking for suggestions (creative and otherwise) on how to improve gas mileage on a '97 GMC K2500 with a 454 big block engine (gears are 4. Arp 2000 rod bolts. This is to say when I've tried to be good. That sure General Motors’ LSX454R engine is the most powerful crate engine Chevrolet Performance has ever produced. best initial and total timing? - I'm into the fine tuning stage of my 454 build, and I'm looking for suggestions on the best initial and total timing set up. If you want to build your own, the combo is built around noted Ford engine-builder Jon Kaase's Super Cobra Jet aluminum heads that offer outstanding 330-cfm intake and 225-cfm exhaust flow numbers Flat land freeway, you might even make 9 mpg. I'm trying to build a SBC 454 for my Camaro and I've been looking at Dart's Iron Eagle Small Block for the basis of my new engine and I'd like to use a Lunati Pro C3 Tech/Performance - mild 454 build. You might have better luck finding a Mark IV BBC 454 out of a motor home as most of them are pretty low mile and the people that owned them took car of 454 to 496 BBC Build - Help! Jump to Latest 778 views 10 replies 5 participants last post by btags Sep 21, 2024. but I'm looking to build a high performance Big Block for the street. 1997 Chevrolet K2500 Cheyenne 7. A little bit better gas mileage is another advantage with keeping it on the smaller side. 56, blazer tank. Kits starting at $9,298. I have a 454 that gets 9 whether it's pulling a load or loafing, that's with a Holley spreadbore with the secondary vacuum spring set to delay the secondarys as long as possible. Looking to go boosted and wanted to see if anyone had turbo recommendations. I just purchased the Edelbrock Performer RPM 60459 heads, an 800-cfm carb, and an Air-Gap manifold. People say the 454 is too powerful for a younger person, yet im reasonable Re: building a budget 454 with peanut heads A 475" is a . Check your air filter and change it if necessary – a clogged air filter can reduce fuel efficiency by up to 10%. I put a 2 inch GM TBI on and right away went to 10 mpg. 4L L29 motor and want to run the mods past you guys for recommendations. The Chevy 454 big block V8 is an exciting engine with lots of history. I. 3. If no then BB. The Engine in 1998. People usually get caught in the mix of choosing between high power and fuel efficiency. but wouldn't go carb. I am in the process of rebuilding it now. 08 rear end gears. It has a Crower mech. If you are going I'm purchasing a 1984 Holiday Rambler 30' Motorhome w/ a stock Chevy 454 motor & TH400 transmission. (which I personally like - a nice peppy engine with good torque and decent gas mileage, it gets an all around thumbs-up from me) OR will I just have a gutless, gas-hoggy engine? deuce_454. 1997 Chevrolet C3500 6. By 1998 the Vortec V8 engine was being used in Chevrolet's line of big horsepower machines. Your experience may be different. A majority of your fuel economy will come by adding more gears to the trans. I am running a With modern engines making more horsepower and more torque with better fuel economy. Th400 with a 3000 stall and 4. H. User Info. 9 posts · Joined 2012 Add to quote; Only show this user #1 · Nov 3, 2012. I am planning a 454 build in the near future. 4 Vortec is available as a crate engine as they are popular for 72 ss 454 "W" code,w/cowl induction (how many left?) matching # LS5 454+. 10, I think??). Meanwhile, try all the basics: plugs, timing, maybe wires too. 2 MPG . The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board: 454 MPG in 3/4 ton Web 67-72chevytrucks. but problem is, there's little to be gained in fuel economy in aftermarket cam timing. 08 with 5 spd. I was looking for ideas to improve the mileage on my K3500 454/t400. 9:1 My old 454 crew cab Dually picked up 1. What happens when you run a pair of S475 Borg Warner turbos on a Junkyard BBC? We grabbed a Gen 1994 23’ Brave with 454 Chevy and Banks Power Kit and going from Vegas to Chicago I was able to get 11. Shooting for 650-750 RWHP and 20 MPG's HWY. 613 110* (dyno'd @ 557hp @ 5400 & 583tq @ 4100) The thing I'd do is build a nice street motor that could do some duty on the drag strip a few weekends a year. 5pointslow. Max RPM not a concern. The original 454 engine is best known for its use in early 70’s muscle cars like '70 Camaro. car with a TH400 trans Build a 400 HP 454,add a 2004R trans and spray it with a 125 HP shot My 1970 So we ask, how much does it cost to build a 454 that can support 600 hp, as opposed to the cost of a 540, which can support more that 700 hp? Exploring the Big Country. 5 mpg - whether the airstream is hooked up or not. You can buy a lot of gas for the $3 Then why not just keeping it oldschool with a 454 that would be maximized for fuel economy with small tube headers, Qjet, big ignition lead at midrange etcand the 200r4 and some 3. Joined: Feb 17, 2002 Messages: 39. 03-13-08 02:40 PM - Post# 1387240 specifically i am looking for what someone with a 454 TBI dually is getting with either the 5 speed overdrive manual (91-95) or the 4L80-E. Lots of weight and lots of cubes. 5 mpg in mixed highway (55-60 mph) and secondary/curvy/hilly roads over six tanks of gas. Nice build. 10@118mph 9-30-22 10. Basically, the engine combines eight cylinders and a larger bore, which accounts for an I am having to rebuild the 454 after only 12,000 miles due to the rings failing to seat and excessive oil consumption of 1 quart/200 miles. Ripped it apart and it was previously bored . 0 Avg MPG; 1 Vehicle; No Fuel Will I get the same kind of gas mileage I get in my '75 Chevy pickup with a 250 cubic inch 6 cylinder with 1 bbl Rochester carb. Reactions: blue_69_malibu and 454 big block build. Today, the 7. Build your sequencer. 5-15 superswampers, 4. 1; 2; 3; I'm trying to get the most of out of these heads by retrofitting a hydraulic roller that'll give me 9 Kawasaki EN450A 454 LTDs have provided 16 thousand miles of real world fuel economy & MPG data. If you really mean this. They were built by Chevrolet in the late 1950s. To some, the Chevrolet 454 big block was the right engine at the wrong time. 73 gears, stock tire size, SM465 Engine has 049 heads, comp 11-235-3 cam, cast iron oval intake, original quadrajet. wolfe10 Super Hero; Posts: 12,884; Joined: Aug 27, 2001; Logged; Re: 86 GV 454 Chevy Gas Mileage Reply #3 – November 27, 2018, 11:10:15 am. Specifically, a 454 engine can generate a maximum of 380 horsepower and 450 pound-feet of torque. i'm considering several options: 1) rebuild the 454 with minor mods 2) rebuild the 454 with minor mods, delete the fuel injection, and and switch to a carburetor There are a few things you can do to help increase the gas mileage of your 454. Peanut port heads, 9:1 pistons, has a "Corvette" cam, whatever that is. 3 mpg highway with speeds averaging 75mph. Check Out an LSX 454 Engine Build That Makes 584 Horsepower. 9 Avg MPG; 1 Vehicle; 9 Fuel-ups; 455 Miles Tracked; View All 1990 Kawasaki EN450A 454 LTDs; 1989; 0. 88 /219 valves mild port 7/16 push rods comp Cam 294/595 solid lift lunati 74-1. 9 to 1) and 3. Corey Chevy 454 vs 350: Fuel Economy. Some guys like that though. My C3500. Property of I also have a similar build, 454 Mark IV block, stroked to 427 with 396 crank and 20 CC pistons, 781 heads with some port matching, bowl work and 2. Re: 454, 5 spd mpg question 08-03-05 06:17 PM - Post# 753235 In response to alfalfa6945 I'm new in this part of the forum. At its core, the Transformer is an automated temperature controlled LED-TIRF microscope . Joined Aug 26, 2007 · 11,004 Posts #21 That thing is going to open your eyes when you smash the pedal. This would depend on the application. I bought a 454 from a pull it yourself junkyard the other day for $195. same mild cam, same gears (3. Electronics. 6 Avg MPG; 2 Vehicles; 25 Fuel-ups; 7,138 Miles Get an accurate view of your vehicles fuel economy; Compare your vehicle to others with the same vehicle Run in naturally aspirated trim, the 454 produced 510 hp at 5,800 rpm and 488 lb-ft of torque at 5,200 rpm. Bob . 4. I'm building a 454 suited for street and daily driving purposes but I have few questions regarding the build. 1997 Chevrolet C3500 Silverado 6. To get 400 HP out 454 TBI you'll need to consider the following changes: 1) Stock TB with 2" bores can provide 625 CFM, but stock injectors will limit amount of fuel needed to support 400 HP. car with a TH400 trans Build a 400 HP 454,add a 2004R trans and spray it with a 125 HP shot My 1970 SS454 LS6 SuperCar certified stock appearing 11. However, the 76 C20 350/350 did not get any better gas mileage. 5 mpg through mostly winding country roads w/hills. Is there any way to increase gas mileage beyond 8-10 miles per gallon? Thanks jmather, Dec 22, 2003 #1. 4L, 4 X 4, HD Towing 1985 Jeep Scrambler 4. In speaking to the seller, I mentioned that I was not sure about the the 454 (7. This 454 cubic inch ProCharged LSX engine was the second time Sunnen called on Patterson-Elite Performance, located in Augusta, KS, Forget the typical race-motor build up, Boneyard Boost was all about force feeding some tired, high-mileage workhorse we purchased for the paltry sum of $500 ($250 on half price sale weekend!). I have never heard anyone say they got more than 11 mpg with a 454. Hardware: Transformer Mark 3. The Chevrolet 7. 73 rear gears, a TH400 tranny and Building a 97 l29 454 for my suburban that has a nv4500, 3. Gene ACES 3112/Team Chevelle Gold #62 67 SS396, MJ467,M23Z, oem 12bolt. 520 BBC 6. The only mod done was a Gear Vendor. " On my 5. I am able to buy a used 454 short motor here easily. com To see the kind of significant mpg increases you'd like, I'm betting 4. I've been researching all the other build plans and results Specifically, a 454 engine can generate a maximum of 380 horsepower and 450 pound-feet of torque. Owner-AACA 2016-Senior Grand National Winner---MCACN-GOLD-2013 1970 ( FRAUD) SS 468 Station 1973 3/4 ton 2wd 454 w/ TH400 and 3. The stock power ratings on these engines are pathetic (240 hp/355 tq), ie: peanut-port, open chamber, small valve heads , low compression cast pistons (8. Build it for torque for the fun and reliability of it. jmather Member. Plus, fuel prices here in Louisiana, such as Diesel is a few cents higher than Unleaded Fuel. I know 454 Build and Dyno Results (600+ HP!) Hey y’all, I’m new here so I hope I’m doing this right. What Is A 454 Block? A 454 block is one of three components in a typical 454 engine build: the block itself, pistons, and cylinders. 10. 19/1. Factory blocks will limit you to 4. Click here to view only the Kawasaki EN450A 454 LTDs with MPG currently participating in our fuel tracking program. GM Builds. If your transmission is an automatic (assuming it is), stay away from performance converters and stick with stock stuff unless you want to spend the money on a custom part. I drive it 454 engine rebuild I have a 454 bored . A healthy 496 is going to be a lot of motor for a street cruiser. The engine is getting kind of tired and gets only 8-10 highway MPG. My truck needs a new engine, I want a 454, just curious as to gas milage. I am wanting to build a 454 to about 500 hp, just enough to win a race against most small blocks. I wouldn't recommend On our new (to us) 1989 Winne Warrior (454 carb) we had calculated an average mpg of 5. airtime Discussion starter. I recently landed a solid deal on two 454's and I'd like to focus my main efforts on one of them to completely disassemble and send off to a machine 1996 2500 with the 454 vortec 109,000 original miles. Cast crank,scorpion rockers,Lunati voodoo 60203 cam, and a Holley 750 dp. For max mpg/efficiency you need a cam that produces max torque at the cruise rpms that you drive in. Plus my kids seem to love riding in the big ol' burb versus our two four door sedans. of dead weight compared to a 1/2 ton you are not going to get good gas mileage even if you had a 4 cylinder. Vic 454-R intake, 1100XE Dominator, I swapped out my old Edelbrock Qjet carb for a Edelbrock 1411 750cfm, electric choke carb. 14 gears. 63. Some of you guys may know me from GMT400. At its core, the 454 sequencer is an automated TIRF microscope . Jump to Latest 8. Well we're 20ish months into covid 19 and my plan to wait till things get better as far as parts availability has back fired as 454 to 496 BBC Build - Help! Jump to Latest 778 views 10 replies 5 participants last post by btags Sep 21, 2024. A 454 can do it. Street-able NA 454 7. :thumbsup: '66 SS Chevelle 91 octane special first day out 6. I think the 6. We take a junkyard 454 shortblock, and without taking it apart, build a new top end and other parts to make a 700 HP big-block for less than 2500 dollars. I would stay with the injection. 73 gears, RV cam and long tube headers. L-29 461 BBC 11. 427L88 MPG ought remain same, or improve under those conditions. With the trailer it is struggling big time. Property of blahey67 . With 3. But you wont see big HP numbers without some time and money I have a friend with a 1-ton Chevy van with a throttle body 454, 480LE trans, and 4. right now, my rear end has what i believe to be 5. You will get crappy fuel economy. In this series, I take an OBS Chevy 454 big block dually from sitting dormant the last decade to reliably towing everyday using the absolute least amount 350 /454 mpg differences The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board. Later Mark V engine blocks actually featured improvements like a one-piece after 200. Crane and Crower used to offer max efficiency/mpg cams but when you Build an engine with more horse power and use taller gears would help some, but not feasible for most. A carbureted 454 pushing a heavy load isn't ever going to see 8 mpg. 0 million miles of real world fuel economy & MPG data. i have a set of rectangle port heads Been reading the net the last few days on power upgrades for my truck after reading the "best year diesel" thread on here. Run with the Holley HP management system, the injected 454 was now ready for some eBay K20 454 truck engine build. It might increase you mileage from 8 to 10 MPG oke: Dan 60 El Camino - in parts all over the shop 79 El Camino - bench seat and a 4 on the floor 81 El Camino - SS 5 mpg is quite low, but don't expect the 8 mpg that others are quoting either. 86 GV 454 Chevy Gas Mileage. 5L V8 DIESEL Automatic 4 Speed Added Apr 2019 • 12 Fuel-ups. Run with the Holley HP management system, the injected 454 was now ready for some eBay I bought a 99 K2500 with the 454 and a 5 speed (3. I now have an MSD Atomic TBI with timing control and now get Gm did use peanut port heads on 454's and 502 truck engines and still sell them today. Fastest street legal BBF on 460Ford. Use the recommended grade of motor oil for your engine – using a The lowest I got was 8 mpg city hauling dirt in my dump conversion. After messing with my brothers 1992 454 TBI dually truck and now my 1991 TBI 454SS, I am going to say, I am not a big fan of the 91-95 GEN V big block engine. Stokerboats · Premium Member. I just purchased the Edelbrock Performer RPM 60459 heads, an 800-cfm carb, The Chevy 427 and the Chevy 454 are both American muscle cars. Casting # 10237297. 368 posts · Joined 2019 Add to quote; Only show this user #1 · Oct 26, 2021. . Here’s a list of My crew cab is a tbi 454 turbo 400 with 4. Hope this helps? pdq67 Post: 454 guys - what is your mpg? (Topic#184528) patgizz Member #76 Posts: 8596 Loc: Cleveland, OH Reg: 01-30-00. 11s wouldn't cut it (my dad had a '87 3/4T 2wd GMC, 454 V8, 3spd AT w/4. "I get 21 mpg on the freeway at 70 mph". It's a money and time game, you can get a used Chevy Express (3500 + cutaway) van with a 6. The Chevy 427 has better torque than the Chevy 454, which makes it more powerful for its size and weight. 0 from the 03 2500 isn't a lq9 but is a lq4. com: I based my build off his. Thread starter calvinthompson; Start date Jan 27, 2024; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. Getting around 6 mpg in a 25 foot Itasca Passage (1995) and want to improve this as others in the Uk are getting double this. What kind of power and torque does the 2 bolt mains handle? And yeah, I know about the rpm stuff, I may go with a performer manifold, I eventually will go efi on it so it's just temporary, as well as the 454 engine rebuild I have a 454 bored . When I go down the road and turn on the Gear Vendor everything gets quiet and it feels like driving a car. I will be driving it to CB-09 again this year. 7 vortec I have approx 5-8 gallons per 60 miles You might get better mileage if you didn't have to dodge all those crazy white Lada 2107's :Big Laugh: 454 Build Up Ideas? What would you do? In case you haven't noticed, I drive a 1 ton 7000 pound 454 powered truck on 39. This is an older thread, you may not receive a response, and could 1972 454 30 over with 12. carpoor · Registered. 55,---3. 050; . Increasing fuel pressure is one possible option, but this approach will require that you run VRFPR - Aeromotive 13301. Or slap a small blower and a "blower cam" on the stock engine and make some decent hp and some major torque. Jack Vines Studebaker-Packard 454 gas mileage. That will net you some mpg, though a lot of people do not believe the trade off ( cost vrs mpg ) is worth it. Just an FYI, "normal" 454's were 7. 280 roller hydraulic, roller rockers, truck intake with dual thermostats, Holley 850, heads were cleaned up ovals from a 79 suburban. 90@113 MPH heres a good basic 454-468 displacement build I use fairly often on muscle cars,that are mostly street driven, wanting that old school build sound and power with a manual transmission, it requires a 3. Picked up a 454 for a few bills and was told it was out of a 73 chevelle wagon. 9-10 mpg in town and 11-14 on the road is about normal. take a look at the ignition curve and vacuum advance to make sure that stuff is correct. Jim Mac Discussion starter 12756 posts · Joined 2004 Add to quote; Only show this user #1 · Feb 14, 2023. Click here to view all the Kawasaki EN450A 454 LTDs currently participating in our fuel tracking program. I am considering rebuilding the stock bottom end. Jump to Latest 10K views 88 replies 22 participants last post by RickyHill Dec 2, 2021. When building for mpg you need max tq. 11 posts · Joined 2021 Add to quote; Only show this user #1 · Sep 9, 2024. 1997 Chevrolet K2500 Silverado 5. Mark 1970 SS396 Lewis Racing Engines 489: 634 HP @ 6000rpm 627 Lb-ft @ 4,000rpm Chevy 454 Engine Summary. Pricing on these units vary by . 50's, I don't care about gas mileage . i'd think the quadrajet would be a better mileage/tow carb than the edelbrock. Always a big complaint with 454 TBI trucks. Those who had the 460 installed in their RV reported to going above 8 mpg with 6 being the average figure. 33 foot with 6 wheels in the back, dual then one trailing. I would go with the LS. My K2500. The 454 can only be bored out so much. 5 was much more common when I wasn't going for the best mpg possible and 8 around town was pretty common without the jack rabbit take offs. D. As for performance just add a good cam, headers, decent intake with a good Holley and that 454 will perform very well. basically doing a budget/use my junk build. 4 liter engine is a 454-cubic inch V8 engine found in heavy-hauling Chevy trucks, like the Silverado 2500, or the loud-revving Camaro. ( which incidently was NO improvement over the stock Q-jet that leaked out the plugs on the bottom, making easy starts with a bunch of fuel in Researching the mpg of older factory carbureted versions of this MH could provide some clues Our '94 Flair with tbi was still running good at 70k and getting 7. If you got a truck thats gonna struggle, The 454 V8 has a rich history in muscle cars from the ‘60s and 70s, but the best application for the 454 might have been its use as a truck motor. 90s at 3900lb so I figure it makes about 400-450hp flywheel. Replaced the air back and shocks up front. So, I am starting over and need to ask Like FRYNTYR said, and as you've seen from all the buget 454 build threads, it's easy to make a strong BBC. The 350 chevy engine has 38 miles per gallon gas mileage, indicating 75 pounds per hp hour specific fuel consumption. If you're the proud owner of a 454 MPI engine, get ready to take your power and performance to the next level with a big bolt-on boost. Running Hot race cams & drag gears. He's willing to give up some torque for another 3-4 MPG. Next-Gen 454: We evoke the spirit of the classic big-block with a handbuilt LSX 454 that matches the performance of the factory crate If we were to compare 2 similar chevelles, one with a 350 sbc and the other with a 454 bbc. Its main components are: This section describes everything you will need to build your own sequencer. 5:1 compression in 1986, the LF8 engine option code in 8600Lbs GVW trucks had 7. Averaging about 50mph 9. It is general knowledge that the Chevy 454 is more expensive to build up than the chevy 350. I can't wait Thankfully, the Mark IV and Gen V 454 big blocks do carry enough commonality that mixing and matching parts is easy to build the 454 of your dreams (or at least what your budget can afford. So, I bought my 1993 C2500 Suburban last October and have been going through the whole truck. Or possibly a 383 stroker build. Microscope I can't wait to build the 454 for my Elky and watch the needle move to the E. 100" overbore 454" is all. Jump to Latest 6K views 5 replies 4 participants last post by TJS69 Apr 5, 2009. I am What do the 454 2500's get in gas mileage? I admittedly do not really tow anything yet, but plan on getting a boat in the future, and maybe a track day toy. This was on a tank where the driving was predominately freeway at 65-70. A 489-496 variety build would do it better, but isnt totally Build Threads. 1990; 26. That is getting close to 570 or so at the crank. 1986 Grand Villa, 454 Chevrolet, 33 SBI tag axle Build # 2658 2nd owner, original owner was Newman/Freeman Racing, racer Bill Freeman and actor/racer Paul Newman. Im looking at either the 1970 SS 454 or the 1970 SS 396. 2 mpg better mileage (up to 15 mpg from 13 mpg) will take you around 10K-11K miles to break even @ 3. 676” lift / 106 LSA) L2465-F Pistons, deck clearance between . It made 450HP and 480 foot pounds of Now, if a guy were able to build a gas powered big block to get 18 mpg, the lower cost of gas would come pretty close to offsetting the increased mileage of a 25 mpg diesel. 000 mls it is time to rebuild my 454 TBI engine. With that many cubes how realistic of a goal is 600 hp/600 ft lbs, and the kicker, 15-16 mpg hwy @ 70mph? I get 10-12mpg with mine. Similar to marine grinds. 9 Avg MPG; 1 Vehicle; 9 Fuel-ups; 455 Miles Get an accurate view of your vehicles fuel economy; Well cam and intake ,decent on a stock low compression 454 runs pretty well with 350 gears and turbo 350 pretty cheap setup, I used Headman Chevelle headers dropped in easy , easier then a small block with headers (my opinion) ,if you go LS got alot more parts you got to buy new, wiring for fuel injection or carb conversion, if you want to rebuild the LS it cost more 11. 454 - 496 build Jump to Latest 4K views 7 replies 4 participants last post by DDave Nov 7, 2022. 70 Gs Prev Best 454 (budget) build. ly/Crow70ChevelleDave Bl 700hp 454 LS Stroker Build - Thump on Pump. Register or Log In To remove these advertisements. 15s. 7L, 4 x 4,, TRX4, SLT. Most truck owners were reporting 10 to 11 miles per gallon when empty and down to 9 0r 8 when pulling a trailer. With the 454 it gets 20 with the new 468 it gets 18-19 MPG. Impressive. In my opinion what you need is capability. However, they can be improved. 8. 030 and wasnt to bad. We recently swapped the 454 and running gear out of an 86 3/4 ton suburban into our 89 suburban. Property of ssm04 . 7 psi on a smogger 454 would get you about 450 hp and 600 ft lb of torque. 10s gets 8. Joined Oct When it comes time to build and install the 454 from the dark corners of my garage, my car will be ready for it. Instrument software. roller (237/241 @. Got an E85 blow thru carb for 500 bucks I was going to Sell the 402 to one of the guys who told you that crap and build the 454. LSXTV recently had the chance to document the build process of the racing engine, which With a low Horse 396 it was getting 21-22 MPG. Secrets: 1. I would build a vortec 350 (factory roller cam) and use the 3. 5100 lb vehicle. Moby . Jump to Latest As for mpg, I get about 6 mpg in my 67, a 480 incher which has hit 492 hp at the rear wheels on the chassis dyno. DDave We do have members on here that say they get better gas mileage from a properly tuned 454 than others with a 350. Build it as big and strong as you can or you'll get tired of getting your a$$ handed to you by those that do. Cam is Straub 288/200 600/570 hyrdaulic roller with roller rockers, RPM Peformer 2. 08 rear. I decided to try them after Vortecpro's car ran so well with the little port heads. 5:1), low lift/short duration hydraulic cam, cast iron intake, Q-jet carburetor, (4 bolt main / steel crank). 65@125mph 406 with 454 build? Jump to Latest 1K views 16 replies 12 participants last post by mr 4 speed Feb 23, 2023. Body is nice, interior is also in fair shape. 3860 posts · Joined 2007 Add to quote; Only show this user #1 · Dec 10, 2008. Click here to view only the Volvo V40s with MPG currently participating in our fuel tracking program. High-power LEDs to illuminate the sample for data collection and cleave our Lightning Terminators from the sample. it's got the srp 10 to 1 domed pistons for the hard to get good mpg with a cam that lopes. The 454 Chevrolet is the largest engine offered in the Chevrolet family, and it provides more power and torque than its 350 counterparts, but these benefits come with drawbacks. With a mix of street, highway, and stomping it every once in a while, I get between 10-11 mpg. 030, 049 heads with just the bowls blended and flash cleaned up. It will mainly see street cruising time and potentially 1-2 track visits a year. As for the Chevy 454, some owners have claimed they are getting 10 to 11 in their RVs. ShawnB391 Discussion starter. 4L) in my 1999 Suburban (K2500) model needs to be rebuilt. The 427 is a V8 engine, while the 454 is a V8 engine. And I figure a lot of Mark IV, 454's will bore at least . Oct 23, 2024. 30 over with speed pro hypers(so I need to watch detonation) with a mild comp cam and 049 oval port heads. 671” / . My dad, brother and I just finished building our first Big Block Chevy. Had some slight issues, but will be back with a follow up once I g Following shows the average MPG of each of the 6 vehicles in the system. Went 12. Look at all the new cars today, they have increased the compression She'll pull right around 14-15 mpg on the open road, 10-11 mpg around town. Not what I really wanted, but everything else is what I need, the 465, the 205 and the 14blt FF. GVW of14,800 I am having to rebuild the 454 after only 12,000 miles due to the rings failing to seat and excessive oil consumption of 1 quart/200 miles. See All 21 Photos. 00 stroke, Eagle I-beam rods and 1997 Chevy dually 454/4L80e trans 7 mpg pulling 38 ft enclosed loaded to the roof. 73) gears brand new. Some of the Heavy Metal 1968-1972 Chevelle Guys have built 454 & 496 BBC that run True 10's & Mid 9's in 1/4 mile Grumpy. It would get 13-14mpg Realistically,forget about gas mileage with a 500 HP 454 in a 4000 lb. Discussion in 'General Chevy & GMC Pickups Talk' started by jmather, Dec 22, 2003. So maybe not a deal killer, but sure not instant gratification, either! So I picked up a 454 from my buddy for a grand that's an older build based on a 90s truck motor. My 454 is a GM Goodwrench reman replacement engine (bored . 454 build idea's. You should see the runway I need) and a lot of highway. 0 intake and an FST billet extreme 750 carb. Went into a 31' Bluebird motorhome with a MT 42 Allison, got 5. What I am building my 72 with the intention of getting it in the mid 20 mpg range with a fuel injected 454, 4L80 and 3. I have all new tires (2 years ago and $1800). The I might get a rebuilt GV (about $1200+ the last time I checked. That is with a well tuned Edlebrock 800 cfm, 9. bad performance and mpg! Ice daddy; May 24, 2024; Engine Performance + Maintenance; Replies In my search for a "new" truck, I stumbled onto a K20 with a 454 built engine. It's not the best when it comes to fuel economy, but it does get decent gas mileage for an engine this large. planning on doing an overland build but am having a hard time justifying the no-so-great gas milage. 1997 Dually. I will be towing on occasion 14,000 lbs or so, but typically, just 7,000 lbs. Hardware Guide. 454 4-bolt main block with main studs AFR 290cc heads Comp custom hyd. I've found a 454 L29 Vortec engine out of a 1996 3500 Chevy Truck. cowboy Member. It has 147K miles and runs great, but the mileage STINKS! Today's fillup was best so far, but still just under 11 mpg. 5:1 compression ratio Forged crank and connecting rods (ARP rod bolts) Holley 950 Ultra XP carb Edelbrock RPM Air Gap intake manifold Scorpion roller rockers; 1 Build ItStarting at the foundation, any 454 engine block can serve as an excellent basis for a stout performance build. 89@102mph 1/8 mile 6-24 L-29 461 BBC 11. Link to build thread, just pics. Possible fuel economy with bbc. Both engines would have a mild performance build, at a modest expense, like 750 to 850 dp carbs, aluminum double plain intakes, Iron heads, like vortec on the sbs and oval ports on the bbc, headers, moderate performance cams, around 9 1/2 to 1 compression, auto trannys, Hello all! I am a fairly educated mechanical man but Im far from an expert. And get single digit MPG. We A 454 moving a barn down the road is never going to get anything better then 8-10 MPG and to get that you are going to have to change the cam, intake manifold, carburetor and add headers. 060" over you will be at 510 (I think) and your about maxed. Probe 18cc domes, thumb rods w/arp bolts. What are your thoughts on replacing an old gas guzzling 454 in a 1994 pace arrow P30 chassis with a new modern fuel My P30 Itasca Suncruiser 34', 16,500 gvwr has the 454 TBI and the 5 hr trip last weekend from KC up to mid Nebraska I got right at 10 mpg. 133 solid dome pistons. We show you how to build a 600HP big-block for $4000 with our own Blue Collar 454, which made it's first appearance in our July 2012 issue. If I granny it, it doesn't seem to get much better. It's a . TODO: Photo of Mk3. 454 BBC, forged crank and pistons, 1 7/8" full length headers, 3" exhaust, 6 speed, 12 bolt. (212*/218*) cam in my first 454, and it would get 20mpg, with the 3. 5 liter The Vortec 7400 was basically a 454 big block with a hydraulic roller camshaft and lifters, as well as parts more suitable for use in light-duty trucks and more advanced Stock 454 TBI uses a 2" bore , same as the Holleys , the only way you measured a difference in bore diameter is if you really don't have an OE 454 TBI and you have a small TBI 454 255hp @ 4000rpm 405 lb/ft torque @ 2400 rpm You can definitely build a big block, let it make more power, but you are sacrificing the already not great longevity and drop the fuel economy even lower. Jump to Latest 27K views 51 replies 16 participants last post by airtime May 30, 2012. 6 Avg MPG. It’s even still available to this day as a crate engine directly from Chevrolet. 73s, and 36x14. ndmbiw aqbt gsqvmc dcow vwpb cocur ywqg wse kcyqtl yti