383 vs 454 gas mileage This is an older thread, you may not receive a response, and could be reviving an old thread. 5" rear tires, spinning at over 3000, the 427 tripower got 17, the 427 750Holley 14 mpg, and now the MJ467 with a fat 850 race Holley and no vac adv will pull a freckle over 16 mpg. 3 L - 262 cid. Any thoughts would be great. Insert Quotes Post Reply Related Threads I have a 63 Sport Fury with a 10. Following shows the average MPG of each of the 17 vehicles in the system. With what you've spec'd for the 383 Stroker Vs. The 454 is probably your best bet for continuing to use this truck. Put a 420 hp/460 lbs of torque 383 stroker in a 69 chevelle with a The small block car will handle better. This is also my nice (i. 07 12 bolt I have FYI, a 454 with get about 20% less mpg than a small block. Doesn't sound good. aren't really concerned about gas mileage. 23 gears and 235/70x15 General Q & A - Pros/Cons 383 vs. 08 posi, built 383 stroker, TH400, 13" towing converter, 26mpg highway, 22 city, daily driver/drag truck. You need to feed the beast. Now, I have not done any tuning on the carburetor in regards to metering rods or step up springs (Edelbrock Thunder AVS2 800). I started by adjusting the fuel prime – which squirts a small amount of fuel into the intake to aid in start-up. arncejoshua. 79 @ John Austin Katy, Texas '70 SS454 Chevelle "clone" project My combo: 496 BBC (454 +. Emery19. 4L V8 GAS Automatic 4 Speed Added Aug 2024 • 22 Fuel-ups. Both engines will be build to about 450HP, however the 383 will have a little less tq @450. Log in; Sign up; DodgeCharger. (owned since 1978!) 454-th400 3. Chevrolet 454 engines never really disappeared since 1970. Stupid question many would say but fuel costs over $7. I love my 383. 00 per gallon here so frequent use of the car soon results in a hefty fuel bill but when the time comes for an engine overhaul a stroker kit seems to make a lot of sense. The 454 Chevrolet is a big block engine. this year from Pittsburgh to Nashville Tn. Does it get decent gas mileage, sure. What's new. Honestly a 383 would be perfect for you. Improve the MPG of your vehicle with our gas mileage tips. I say keep the 454 in place, port the heads optimize the quench of the chambers, and add a water methanol Forums. What's the fuel economy of the 454 gonna be like against the 383? & like Kettbo (George) stated,all it takes is a little savvy tuning & a very little well chosen parts and a stock sounding 454 can make 400+hp. Joined Apr 25, 2008 · 89 Posts #61 · Oct 22, 2010. 383's are great engines as well. Fuel usage for MerCruiser 3. 454 - Boy, is this ironic! I just finished on the dyno today with a 383 Chevrolet small block combo. Not because the 454 big block is an inefficient engine, If you were comparing a 396 vs a 406 I think I'd lean a little more toward the 406 but even then the 396 has the advantage of bigger heads with more airflow capacity. Joel Wilson 1/2 ton status. I'm considering a 383 fourbarrel and some taller gears what kind of milage can I expect. I have the option to use an sm465/np205 as well. 10s and 35s. I am getting 19. remember one thing, horsepower sells engines. Performer 383 vs RPM Air Gap. TCI TH350. It's a 1985 Scorpion 24' that weighs approx. The 454 will become a 496, then a 540, etc etc. 56 12 Bolt posi 63 Corvair (Wife's driver) 102HP!!! All original, 75K 72 240Z 140HP all stock, 275K Gas mileage is predominately determined by the weight of the Following shows the average MPG of each of the 9 vehicles in the system. 2 | 7. Products Featured in this Article. Hi all, I have just aquired a suburban with a 454. Like these comparos, I just think the LS as a more modern design is a little better. 1 4 of 4 Go to page. Im sure the motor could use a tune up, but it runs perfectly, just doesnt make any kind 454 vs 350 gas mileage. 454 (Topic#241331) blue 87 V10 Senior Member Posts: 267 Loc: Newtown, KY Reg: 10-29-03. 5" w/ 14" baer disc brakes the works. 05 LLy ecsb, leveled, 285's, Banks intake and 6-gun, straight piped, lbz mouthpiece. 94 gears 23570r15 tires. :sad: Wrong way to look at things in street performance. New posts New articles New profile posts New article comments Latest activity New showcase items. Drivetrain & Performance Gas Mileage on Stock 383-4 68 Charger. 39, 9. i have a question for you guys to help me with. Has anyone know of any one who has ever put one in a boat and got better fuel burn. New posts Recent Posts Classifieds Search forums. 0 GPH (79. Send Private Topic View Profile. That’s right foot controllable with a DP carb. gas mileage on a chevy 454. 7L V8 GAS Added Aug 2017 • 106 Fuel-ups. 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, 454, TH400, NP205, 6" Susp Lift, 35" Tires , Lockers front / rear (Soon to have MJ454 Tow Motor and GV Over drive) (383). 1993 K-2500 Suburban Silverado, 7. i hope he comes in to update us The Mopar 383 {1962 thru 1967} ~ 'You Magnificent Bastard' An overview of the 'durable' 383 from 1962 thru 1967. Sasquatch. In addition to the cam, Comp also supplied the On a VS carb, it has to be getting the opening of the secondary side timed right and full open at its earliest without issues. Discussion in 'General Chevy & GMC Pickups Talk' started by jmather, Dec 22, 2003. The 350 in my truck still runs like a top but its got close to 150K on it and i hope i can get another 50K out of it. View (1) $626. 1970 Chevrolet Chevelle SS 6. 0 | 4. Jump to Latest 21 - 36 of 36 Posts. 8:1 measured CR and a 'grunt' Crane 282H08 103072 cam. 40 over Comp 268H cam 906 ported heads 750 carb Tti system 2. 525 specs, 3. I'm guessing they would be *roughly* the same price as well, stroker 383 vs crate 454. Shadetree55 454 Replies. which one? Jump to Latest 61 - 68 of 68 Posts. In the original article, I mentioned I was not an EFI expert, but after some simple research – and with the help of the Holley tech line – I was able to inflict some simple adjustments to make the Sniper even better for my application. AVS Forum 1. (CB-07) on the interstate without the air on. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3. There is a ton of potential in the oval port BB heads. Single plane intake. 72 Concours Wagon 5. The 454 would out do the 383 even if it was just rebuilt with some * 1959 Impala __ 2dr coupe - 383 Stroker-TH400 * 1955 Belair __ 2dr coupe - 283 alum. 250 vs the 3. 1. Joined: Dec 8, 2001 Messages: To your questions; the 454 will work much better then your current setup. Road Grabber; Jan 3, 2025; Engine, Trans & Driveline; 2 3. Can I expect to get the same number of miles and service from a 454 as I can with the 350? Thanks . I hear the 8. 4 MPG - this tank was 7. Please consider creating a new thread. 4L, 4 X 4, HD Towing 1985 Jeep Scrambler 4. jmather Member. I have a nice 358ci 383 / Quadrajet / TH350 / Dubblah / D60 / 14FF / 42's on Stazworks / heavy foote / four eyez / forsaken running about 45-50 mph and getting about 4. I got a 71 Chevelle SS clone with a mild (300hp) 350 and I am seeking more power on a budget. 08 rear gears, and still have a decent takeoff due to the amount of torque, and the 3. Engine. MLS Cometic Vs Felpro 1009 with Aluminum Heads. 1994 Chevrolet K2500 Silverado 7. I drove this truck almost every day. 070" stroke which makes a 391 out of a 383 or a 396 if the engine is bored 60. 0 | 5. You need to look at high average torque AND getting the power to the ground right away 383 already in place vs. EPA gas mileage, safety, air pollution, and greenhouse gas estimates for new and used cars and trucks. It doesn't get as good of gas mileage though haha, and it's not injected. Jump to Latest 16K views 11 replies 10 participants last post by DoubleVision Jan 16, 2008. Is there any way to increase gas mileage beyond 8-10 miles per gallon? Thanks jmather, Dec 22, 2003 #1. Nick's General Boating Discussion - 383 Mag Mpi Vs 454 Questions - How much weight difference is there between the two?? How much do you guys think that weight difference makes on performance?? Anybody running the 383 that used to have the 454?? How much of a difference in mpg if any?? Then you started this stupid 383 vs. Plus if you stay with the 383, nothing else really needs to change. Moosecountry · New Style 1968 Street Musclecar Battle 1968 Plymouth Road Runner 383 vs. Assuming all else was equal, cam, compression, gearing etc what increase in fuel consumption would you expect changing from a 350 to 383. HP Fuel consumption WOT (Twin) Boat owner? MerCruiser 3. Core Requirements: 75 mph and as 454 big Block Gas Mileage. and it also gets Thoughts on 454 vs 383 I read conflicting info on weather the TH350 will hold up behind a 454. 25 MPG 68 Newport, 383 bored . 15, 454 2 thoughts on “ Small Block VS LS: Which 383 Reigns Supreme, Mild And Modded ” MGBChuck June 8, 2021 at 5:11 am. is that the larger displacement engines are turning lower rpm with better street manners than mine. 10to1 gears and a 727 i really like the car but I hate it's fuel consumption. 1L truck. This allows for simplistic parts to be used with less risk of a cylinder going lean. the forged oem crank will not become a mailbox mount. 25 MPG 66 300, 383 625 cfm carb 452 ported heads TTi 2. 0 gets 11-15 mpg. I've been planning the 383 for a while now and have accumulated some parts: a 4-bolt main, '90 350 for the block, rebuilt vortec heads, GM 4-barrel vortec intake and adapter for TBI, and complete roller valve train from a vortec 350 (cam, But is takes a lotta time, money, and effort to get a SBC, even a 383 to run with a mildly warmed-up 454. 3M members Thoughts on 454 vs 383 I read conflicting info on weather the TH350 will hold up behind a 454. Reactions: ZooMad75, folkenheath and 82355. roller camshaft, 1X4 750 Holley carb, Brodix Mild ported heads. CallMeYams Discussion starter. People still get glassy eyed over a big block though, whether it is quick or not. TBI 383 1978 Chevy K30 'The Bomb Part II', 350 Qjet (4x4 Duallies with Dump, 9'-2" BOSS Power V's) I had a '97 Chevy CC with a 454 that I How Many MPG Does A 383 Stroker Get?-----James Webb (2022, August 4. Can use the vortec heads. 06 first gear in the tranny (I am assuming a 4l60e). December 29, 2024, 01:14:56 PM. If I am only going to get 8 MPG, I sure as shit ain't sticking with a sbc. I don't want to destroy the General Q & A - Pros/Cons 383 vs. I'm all for a good efficient head, thats sized right, where cross section is more important then cc. The 454 is turning 1950 RPMs at 75 MPH . April 1, 2013 at 9:40 pm #1281527. 5-9. The 383 also won't make the kinda power the LS will sadly. The 454 built into a 468 or 496 gets my approval for a long life at less stress. from what i have read, a 10 bolt is strong enough as long as you don't get massive slicks and a t-brake. 454 Big Block The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board 3/4t's with 4. i plan on running a tko 600 and my rebuilt 10 bolt. mark in NC 454 gas mileage. 760 arm. I had a CCSB with the 350, was a great truck, but was a dog with that motor. 699 posts · Joined 2002 Add to quote; Only show this user #1 · Feb 28, 2003. MHO I would just build the 383 with a Sniper if that's where you're leaning anyway. Property of dendress . Now you big block 454 guys, those engines are pretty inefficient but strong and their strength is A 409 Chevy wasn’t known to want stick together nor a 454 especially if you run them really hard. I drove this more than the '08 Tundra that was my dad's. First tank I got 6. 383 stroker bad gas mileage. 82 comp and a hyd roller cam with 224@050 . 2" 3. Those who had the 460 installed in their RV reported to going above 8 mpg with 6 being the average figure. I've got a 383 that's 430hp and well over 400ft-lbs of torque, which out-paces the LQ4. it isn't small, but it certainly isn't huge either. super swampers) after the lifts they all got 10 mpg, except for one, in that one I chucked the 350 for a 454 and actually got 12 mpg. Not looking for a race car so a 383 would probably be enough power but it seems to be easier to find a 440. mr55/56 250 Replies. Joined Jun 7 383 Stroker Vs. 454 thing to distract from your own idiocy. 24-08-2013 The 383 cubic inch engine was a stout performer, with 330 horses on tap and 460 lb-ft of torque right from its debut. I can beat my wife every time at the gas mileage game. Posts: 251. The 383 Stroker was further upgraded with a healthy Comp XR294R cam. Holley 0-83770 770 CFM Street Avenger Aluminum Carburetor. 73 12 bolt, GMPP HO roller cam, Hooker 383 vs. A 409 Chevy wasn’t known to want stick together nor a 454 especially if you run them really hard. You could go with a set of 2. GAS MILEAGE. 29 posts · Joined 2012 Add to quote Then add a 454 crank and get a 454 with very thin cylinder walls. 540″/0. Most guys who build a 383. High winding with the correct components, Cam/Springs ETC! 440 is a RB Torque Monster in Lower RPM and Lots of Juice! They Both are great! The RB engines are heavier and taller. I guess you cant really equate the mileage a car might get with a 454 vs. i did see a truck with a 454. Argentina. Right now I get 12-13 mpg from just driving around, and about 9-10 loaded. 060), Muncie 4 spd, Centerforce dual fric clutch, "781" heads 2. Re: 454 vs. This would depend on the application. After that, it’s splitting hairs. Welcome to DodgeCharger. The LS will. Forums. Lots of options on that high torque 383. 73 gears and an over drive tranny. 15. 454 , 383 and MPG are 3 things that don't belong in the same sentence . More From The Project Chevelle Series: View Series. smoke grub. It’s certainly best known for its stretch in muscle cars of the early 70’s. i get about 11mpg in my 6. This hot rodded 383 TPI motor will also make a TON of low mid torque and more HP than the L31 vortec 350. 350, 383, 454, 496! Vbb199 said: Run the 383. It's a 1985 Scorpion 24' that 350 /454 mpg differences The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Register or Best I ever got was 13mpg, usually averaged 12mpg. 7 powered truck that Fuel consumption calculator - MerCruiser - Cummins MerCruiser - Crusader - Volvo Penta Diesel - Mercury - Evinrude - Honda Marine - Yamaha Marine - Suzuki Marine - Tohatsu - Johnson - Outboards | GPH MPG LPH KPL 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 need to buy a new truck. The reason to take the 383 over the 454 is the HP and Torque. 890 posts · Joined Does anyone know what it would take to swap the 350 my truck came with for a 454 of the same years (1996-2000). 562″ lift split, a 242/248 degree duration split and 110 degree LSA. :angry1: todays gas prices take the fun out driving. 9. I realize the cost will be about $1,500 - $2,000 more if I go with the 454. Most truck owners were reporting 10 to 11 miles per gallon when empty and down to 9 0r 8 when pulling a trailer. i believe under a 1. SBC 454 vs BBC 454. 454 vs. However, it was also used in Chevy and GMC trucks from 1973-1991. 030 over Forged rotating assembly with 10:1 forged pistons Project Chevelle Episode 16: 383 vs. This kinda 454 will go into the 12s with street gears. the olds will have more torque than the 454 but the 454 will probly have more horsepower. 08's), same truck. 3L, 4L60E, 12 bolt posi 3. 454 - Ok guys I'm in the process of deciding what I will use to power my next and hopefully final project. I'm not looking to make it a show car, and I'm not trying to fool anyone in to thinking it's an SS/RS, which is why I'm leaning towards the 383. 350 vs 383 fuel economy? Driven sanely your gas mileage will be near the same, a stock 350 slightly betterif you keep putting the right foot down hard the 383 will suck gas down like there is no tomorrow. 88, 12-bolt 3. 1, the 454 would still have quite a bit more torque. I'm wondering how what kind a MPG a 383 Vortec in a 2500 LS vs 383 Stroker. I changed the cap and rotor on the way home and that helped the mileage some, but it still didnt pull as strong as it should. I'm torn between the lower cost and lower weight of a 383 SBC and a "period correct" L-78 396 big block. 0. Changing the VS spring brings the VS in earlier or later, and is the primary way to tune them. It has a LS-5 type 454--700R4--3:08 12 bolt. 58 posts · Joined 2017 Add to quote; Only show this user #1 · May 8, 2017. 9-10 mpg in town and 11-14 on the road is about normal. Jump to Latest 19K views 41 replies 23 participants last post by rawkroller Dec 4, 2010. 12 posts · Joined 2010 Add to quote 383 or 454. With no OD, 3. 3 (off boost) so as far as a sleeper goes your going to have a nice idle, very nice manners in reguards to driveability, better mileage, and because the thing has a microprocessors that can change timing and fuel trim in millaseconds Ground up El Camino. Summit selected a long-rod 383 smallblock and a standard 454 big-block for the test. the '72s were DE-tuned to pass emissions. it has all new axles, and 4. Joined Dec I'm replacing the 250 L6 in my 67 Camaro, and I can't make up my mind on the engine. Not in the market for new engine but will need them eventually. Thread starter Rob Scariano; Start date Aug 19, Is the LS a great engine, sure. You cannot directly compare a 350 hp 350 to a 350 hp 454. 23 gears 23570r15 tires16. that there is very little difference between small and big blocks. or 383 into a 71 swb Dodge D100 pick up truck,the goal of the project is for a daily driver with tons of torque,good gas mileage and a liveable idle. In order to meet the criterion of 1. I will be driving it to CB-09 again this year. JAREDS BLUEPRINT 383 PROJECT; BARRYS 383 CROSSFIRE CORVETTE; PROJECT RED DEVIL 94 k2500 454 gas mileage. I am looking at any type of Suburban that they make, including the Cadillac escalade. Chevy 454 Big Block Variants. It has a displacement of 454 cubic inches and produces 425 horsepower at Fairlane against a 454 Chevelle seemed a little too slow. Jump to Latest My 10:1 compression 383 with an Edelbrock 750 gets around 14 mpg average, hwy/city driving. Nothing to complain about between them. My 4000lb, 1970 c10 gets 8 to 9 MPG in the city and 11 to 12 on the highway with a 3. · Jan 18, 2015. the best looking one) truck so I drive it alot for personal use also. Chevelle. 7-1--I hope 450+ hp-650 383 is a LD and a "small" RB . Engine has 10. Not to mention the brackets, hoses, different fan shroud, fuel pump, etc. same mild cam, same gears (3. ) How many MPG does a 383 stroker get? WHYS. 5K views 17 replies 14 participants last post by pdq67 May 2, 2006 Your talking about similar stresses to the forced 383. My car is currently set up for a sbc. rawkroller Discussion starter. LS and you need a separate plug firing box, new intake and headers for starters. If you are cruising around and not racing the 383 will run great and get better gas mileage. However, is it really the best value, debatable! Here's why. 2:1 compression, hyd. 69 Nova, 383 powerglide w/brake 72 Chevelle, Work in progress 70 F100 SWB Sport Custom SWB, 351w Comp cam hedders etc milled heads Holley 4 barrel. 2 MPG. As for the Chevy 454, some owners have claimed they are getting 10 to 11 in their RVs. 1 2. 19/1. Big Block Wars ~ 454 Chevy vs 455 Pontiac vs 455 Olds vs 451 Mopar. dfrazz; Oct 11, 2024; Engine, Trans & Driveline; 2. but torque wins races. This engine is a mild idling street engine for a stock stall converter automatic with huge torque from idle to 4800 rpm it is Idea for a Tow rig , a daily driver rod or a deluxe comfortable show car/street rod. tq and weight almost 3000lbs more. i just built a 1970 olds 455 bored to 463 with E code heads, an edelbrock cam,manifold, and carb, set. 1994 Chevrolet K2500s For Sale Nearby. she will be hung high in the rafters as the little crank General Q & A - Pros/Cons 383 vs. 1995 Chevy 3500HD, RC, DRW, Dana 80 4. Problem being. cowboy Member. The 454 has a lower gas mileage rating and higher durability. 2 x 135 hp: 21. The 454 is an oval port closed chamber unit with 8. Lots of 383 Road Runners kept up with 440 GTX's from the factory in stock form. videoCopyright 2022 James Webb no, they're the same heads now there's some differences in the years on the heads themselves (open vs closed chambered, valve size, etc), but for all general matters, they're the same head 383 vs 440 Big block heads are referred to by the last 3 numbers of their part number: if you look at this example, this is referred to as a 452 head The most common big block My old 454 cruised at 170* with the fans on in stopped traffic. If a Big Block is the "holy grail", then WTF are you talking about a $5K 283 for? Just so we have this straight, the only logical choices are a 454, and LS, or a f-ing $5K 283 got it. Drivetrain & Performance Daily driver 354 vs 383. S. 31 rear gear. What type of difference would I be getting from a 454 or a 350 in gas mileage. How much of the mileage change is due to the 454 and how much to the converter swap, I can't determine. Given the 454 block or the 350 block in a truck. 8. Add in the fact that they're lighter, and its hard to compare. BUT, the efi won't make better mpg. ENGINE: 383. E. _____ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB My 454 (468 cid) gets 1 city/2 highway mpg better than my 396 (413 cid) in the exact same truck using the exact same intake, cam, carb, exhaust, gears, compression, tires, ect. I'm looking to get in the next few months and I'm leaning towards the big block. August In the original article, I mentioned I was not an EFI expert, but after some simple research – and with the help of the Holley tech line – I was able to inflict some simple adjustments to make the Sniper even better for my the mpg of a 454 is LOL towing or not towing. I've got a '68 Fury wagon that I’m going to swap a 383 or 440 into. M. Premium. Discussion in 'The "Other" Bench' started by ronbz455, Aug 4, 2012. I have a 350 with all the machine work done sitting in my garage, and i am planning to buy a IDO » Forums » Fishing Forums » General Discussion Forum » gas mileage on a chevy 454. Semper Fi :fighting0037: I'm just curious, what kind of real world gas mileage does a 350 really get, if well tuned, maybe some minor engine mods (free flowing exhaust and intake maybe). There is no denying the wow factory of a big cube engine. 5 mpg. John Austin Katy, Texas '70 SS454 Chevelle "clone" project My combo: 496 BBC (454 +. 5 system,all else stock with 2. Core Requirements: 75 mph and as The Chevrolet 454 engine has seen several variants since its debut. 10 gears. I saw the 350 vs 454 gas mileage thread, but does the 454 hold up as well, and as long as the 350? I mean given same/proper maintanence? I have had 350s and 305s since I was 16 yrs old ( actually first one was a 307) and know how they hold up. That is why I suggested a BBC earlier because it probably wouldn't be all that much worse on gas and the power potential is so much greater. Done with this moronic thread Ned Reactions: RAYFIN. As a man who runs nothing but classic sbc power, I can fold and be willing to say "the old school performance doesn't make the Hey guys I'm considering making my first engine build up a 383, but there is one thing stopping me. of getting at least 16cty – 20mpg hwy with the correct modifications and driving skills. In ’79, GM got rid of the 454 option in the half-ton trucks but continued using it for heavy-duty truck 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. Some people have used the Marine 350 "Black Scorpion" Vortec (tunnel Ram style EFI system on their hot rodded 350-383 truck motor. (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? Please let me know YOUR experiences with this engine! And 68 New Yorker 440. I find the VS a good carb to use on anything except a racing vehicle or a serious street machine. stock 454. NOTE: with an Auto-Zone rebuilt Q-Jet. And you get the Allison tranny. This site contains affiliate links for which we may be compensated. also a 95 Chevy 5. 1970 SS LS-5/M-22 El Camino- Org. 46 MPG. For generations the marine industry has relied on “marizined” versions of automobile engines, primarily sourced from GM Powertrain and Ford, for its gas inboard and sterndrive engines. It is well known here that the '72 LS5 is identical to the '71 LS5 which was rated @ 365hp. 9 Avg MPG. 8 Avg MPG. Minitub, LT4 383, 8. However, they can be improved. Replies 23 Views 2K. Lower compression, cam profiles, ignition timing, and richer mixtures to reduce combustion temperatures reduced NOx which was the environmental bad boy at the time. 1 post · Joined 2023 Add With factory jetting I've gotten 24 and 23 mpg on 2 occasions when I have managed to hit the highway without playing around. better MPG, and more compression on cheap gas. 63 gears, double framed, 15,000 GVWR Of course the gas mileage will totally suck. General Q & A - Pros/Cons 383 vs. Mark 1970 SS396 Lewis Racing Engines 489: 634 HP @ 6000rpm 627 Lb-ft @ 4,000rpm ProSystems SV1 Gear Gas Mileage of the carbureted vs. 406. 16 posts · Joined 2002 Add to quote; Only show this user #1 · May 21, 2002. There is little engine vacuum when mashing on the gas, but as airflow increases through the venturis, that causes the VS to open. 3 | 5. :yes: klean63 in Super Chevy Magazine 454 with a Holley 750, TH400 and 3. 3:1 compession 440. I told him that he should find a good 454 block on craigslist, get a 496 forged kit instead of the 383 kit for only $200 more $2100 vs $1900, get some peanut port or large oval heads(the car craft engine made 520hp with peanut ports) and use a hydraulic flat tappet cam The only thing against the BBC is gas mileage, I would bet that the 383 vs 350 gas milage Engine & Drivetrain Register or Log In To Wasn't there a member on here that knew of someone with a 383 that got 20 mpg on the highway? IIRC it was built for tq, not hp, but I would be happy with that mpg number. . 55 with Eaton Tru Trac, full CBR suspension With a low Horse 396 it was getting 21-22 MPG. The 383 I'm trying to decide between building a 383 with vortec heads vs swapping in a stock (relatively) 454 TBI from a donor truck. The 383 your gonna spend alot of money to match those numbers. But, as has been said before, BBCs offer more cubes. With the 454 it gets 20 with the new 468 it gets 18-19 MPG. Its not the same on a boat. Put that same engine in an RV and watch those figures drop. The original 454 LS, prominent in early 1970s muscle cars, continued in Chevy and GMC trucks till 1991. That's not a lot of difference. Tossing back and forth between a 383 Magnum (or maybe a stroked) vs a 440. And no. My two big concerns are the weight and the fuel consumption. 454 Jump to Latest 6. 0L V8 GAS Manual 5 Speed in my experience, I had an 89 ford diesel pickup that got about 18 mpg, and a 2000 powerstroke ford that got 16 to 18 mpg, but it had extra150 lb. 08 gear, th400, very Post: 383 vs. 383 stroker vs. but I am wondering how much 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. Go. 7 #SCP1014 roller rockers, Edelbrock Performer I built a 70 Chevelle SS 454 Sta. Save Share 383 SBC. 454 vs 496. I would Chevrolet Monte Carlo 1977, v8 454 contra chevy Nova Stroker 383. 383 for towing and mileage 12-23-03 12:21 PM - Post# 360051 In response to Mel Foye I agree with Mel. I’ve only ever had one stick truck, one that I built lol. The 383 will produce more at their current setup. 383 vs. The engine has a mild cam and a Rebuilt Q-Jet from Auto Zone. 5 vs 454) Jump to Latest RC LB, 12 bolt 3. 1970 Chevrolet Chevelle Malibu 5. Of course I had a lot more power, AND GOT BETTER GAS MILEAGE. I do like to turn corners so that's a 383 stroker vs. The main advantage of the larger bore B design was its less-complicated head design, which was lighter and cheaper to build than Chrysler's early hemi while producing more power. But your talking $2500 to 3000 the second time around vs the 383 or 400 costing you $6000 to 6500. Seems the fixation here is horsepower. Only show this user. I also have a 440 block 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. The 454 big blocks, including LS4, LS5, and the short-lived LS6, set a high standard in muscle cars and trucks with formidable power. Might as well just get the BB now. 51 posts · Joined 2009 Add to quote; Only show this user #1 · Aug 19, 2010. 31 12 bolt posi 71 camaro. 3/4 ton is something I want if spending the money to get bigger u-joints, axles both front and rear, wheel bearings, steering components, and the 4L80E trans. Jump to Latest 35K views 14 replies 8 participants last post by pmd19691979 May 12, 2022. Only checked it once running it as easy as possible. More pictures coming soon the car is a lot further than I currently have on my car domain. and I believe I might be getting better Kallas. Members. 50s with a noticeable lope at idle and cruising the mall, plus was easy to drive. 1 3 of 4 Go to page. So most TBI systems can tolerate radical cams with durations up to about 250° with much more finesse than a carburetor. 1968 Chevrolet Chevelle SS396 An equal battle of Street-Style Musclecars. B. 95 More Info. Chrysler then raised the height of the B block (hence the 'RB' or 'raised I sold the 383 and will keep the big block in it. I just want a nice street motor, not looking to race. 7 #SCP1014 roller rockers, Edelbrock Performer Well economy is a big deal for me because this is the only car i have and when i move out of the house and go to a trade school this is the only car im gonna have i want to be able to afford to drive it. I don't want to destroy the handling of the vehicle putting a big block in it, and I don't want absolutely horrible gas mileage. agree would much rather have a 8. Aug 19, 2016 #9 #1taho 5150TAHO. The temps went up to 180-190 with the AC on. 1 horsepower per cubic inch, the Mouse would need to post at least 421 SBCs also take advantage of MUCH better chamber designs meaning you can do it with less ignition lead, better MPG, and more compression on cheap gas. 36 Eaton Posi, Moser Axles, , E-Tec 170s then AFR CNC 195s Blue Printed by Straub Tech, Custom Mike Jones HR Cam, RPM Air-Gap, Street Avenger 770, Pertronix HEI, Hedman 1 5/8 From the numbers I get from 1/2 ton Sub's, I'm betting the 454 doesn't get much worse mileage in the big body Suburban. e. For us 25% less fuel would be 450 gallons based on the 300 hours a year we put on the boat. 5 MPG in a Duallie while towing a 28' race car trailer with car. If you want a BBC, start with a 454 then think about making it a 496. Oct 14, 2024. Save Share Reply Quote Like. PG. Only the latest , "hit and miss" computerized fuel injection can make a big motor mileage ; the rest is BS . The technology was further refined but remained confined to 454 vs new 6. A simple 60-over 454 displaces 468, so if its big cubes you want, you have to go Chevy 454 Big Block Variants. 73 gears. 6L V8 GAS Standard 4 Speed Hardtop Added Sep 2018 • 8 Fuel-ups. It would pull about as good as the 454 but got 2 to 3 mpg worse. 400 Big Block Wars ~ 454 Chevy vs 455 Pontiac vs 455 Olds vs 451 Mopar. CarinoChevyMan Discussion starter. Property of Skeeter127 . It currently is set up with a 454 400 cyclone and TRS. the project cost about 3000 with the cam Chevy 454 verses 350 on gas mileage. 2 x 190 hp: 32. 31, LS 4 wheel disc brakes 63 Nova wagon LQ4, T56 Magnum, Moser 12 bolt 3. but my refresh will include a 4. 1686 Discussion starter. K2500. hey guys, any thoughts on streetability for the big blocks above, its for a protoured 68 with a 383 tko600 and 373's, mini tubs, 4 link and dse frame connectors already. Page 1 of 2 1 2 Next > ronbz455 Big Butz Racing. Of course I had a lot more power, AND A 454 BBC is a gas mileage pig. 5 system 3. The cost vs the results. 1962 * 383/305 HP ~ 2-Barrel Home. MPG is dependent on gearing and other factors. Jump to Latest My 383 has 215cc heads on it, which are probably 220cc after porting, but still makes decent midrange power, with 495tq @ 4500. 0 GPH (121 lph) etc. Depends what you are doing with it. 73 or 3. 6 I know 454's are badassjust wanted 2 know wat u guys thought454's are tough real tough. 4500 - 4700 with engine, drive, fuel etc. I wanted to put a 454/5-speed that I had into it, but had no where to do it. A big solid cam, an intake with a 850 holley and the 396 could be at 500 hp or close and you wouldn't even need roller rockers with the right factory big block rockers. a car with a 350. hotrodg726 233 Replies. New posts New articles New profile posts The'68 four speed car I had would pretty much take out any Plymouth or Dodge or 454 for I have a good running 383 2 barrel with a 727 in my '69 Coronet. It pulled alot better than the 360 but also got worse mpg. Although it's not an 8. View (0) You dont buy a 454 truck for gas mileage, you buy one because you need to pull and dont want a diesel . It all depends on an early 455 compared to an early 454. The efi just keeps her running smoothly and starts up easily. 1 gets anywhere from 10-13 mpg and the 6. Jump to Latest That's correct. 31 and 27. smallblocked_S-10 Discussion starter. 73 geared overdrive 3900 Lb pick up truck or similar. 67 camaro 420 - 641hp HRcam 1. R. my 427 will fly by 454,s and 502,s. the 383 has ezfast efi on it which, if i can figure out the bugs would put on the big block. fuel injected 454 Another consideration is that these 454s came from and era when performance and mileage were sacrificed for emissions. lbs of torque and 508 HP. 0 lph) MerCruiser 4. 4 | 8. 72 F100 SWB Sport Like I said, my Vortec 454 got better gas mileage than the same truck with a 350. 2 L, 4 X 4, Laredo 2005 Dodge Dakota, 4. which one? Jump to Latest 41 - 60 of 68 Posts. Gas mileage. I have a list of all the parts I need to convert to a bbc (frame mounts, headers etc). 76 gears 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. Registered members Chevelle Mechanical. LS Shootout. Less weight over the nose of the car. I may be a little short on gas mileage compared to an LS, but I don't think it will be by much. I've also gotten 20-21 mpg when farted around quite a bit but still on the hwy. News: My 84 Suburban 2WD 454 auto got almost 11 "empty" and just over 10 US Engines say they use 25% less fuel. Plenty of power, 20+ mpg, easy to work on (everything fits!), parts are everywhere, and the car isn't nose heavy. In ’79, GM got rid of the 454 option in the half-ton trucks but continued using it for heavy-duty truck Diesels - Engine Comparison Article (6. If you want to dip into the 10's at the strip it easier to achieve with more cubic inches. 540 with Brodix heads, Vic 454-R intake, 1100XE Dominator, 260/266 solid roller cam, 10. Distance: Zip Code: Search. Its all power to weight ratio. 1 | 8. “The 383 was created to be a superior replacement for the 454 in every way: improved fuel economy, better durability, and continuing ability to be fully serviced for years to come. Today fuel mileage is the primary The UltraDyne 272H12, whether as a 454 BBC or as a 460 Ford, would deliver 8. Actually, it is airflow through the venturis that actuate the VS, not engine vacuum. The valve reliefs in the flat-top pistons offered ample piston-to-valve clearance for our wild Comp cam. I dont need to turn the engine near as hard to make the boat move. Even in a half ton truck. I like to travel to shows in other states so economy is a big factor in this build. Biscuit6447 Thanks for all the info. Is it reliable, yes. If you use small journal 327 rods on a 383 crank it is possible to offset grind the crank to get another 0. 7L, 4 x 4,, TRX4, SLT. We'll see whos bringin wat at the track, i know my stroker dnt mean **** if his 454 is fixed up but we'll see. New cars use less fuel so it could be possible. The mill is a mildly warmed over 383 with 9. Click to expand I'm really much more familiar with boat engines Does a 383 not have to work as hard and therefore use less fuel? I went from a 330 hp 350 to a 427 sbc and my gas mileage improved a bunch. Our bone stock (for now) 1990 TBI 350 4x4 suburban is probably lucky if it breaks 13 mpg combined mileage. Sandman1278 Discussion starter. Hey fellas, yams back here with an update/question. Owner-AACA 2016-Senior Grand National Winner---MCACN-GOLD-2013 383 10. the car is really a sunday take it out for a spin kinda ride, What kind of gas mileage does a 383 normally get. MPG on a few road trips to Seattle and to Olympia seems to be 10 mpg and with some taller tires I do think I could be right around 12mpg. 2 Post: 383 vs. Not quite sure what kind of mileage i get in my truck now which has a 305. 4 bolt block . The 383 is a stroked 350, so if you were to stroke the 454 it would way out do the 383. With proper tuning this combo can get 17 MPG + in a 3. SS clone 454 4 speed 3. Unless you go with an advanced EFI system , the bigger the motor , the worse the mileage . Replies 49 460 vs 454 Mpg. Discussion of the 331-354-392 HEMIs. I find the SBC terrible for TQ unless it has AFR heads and a 383 bottom end. 64 El Camino 454/M21/4. can use a non vortec head. If i can get about 15 mpg ill be happy. com Forum. gtxrt. 4:1 CR), Lunati Voodoo billet 60213 hyd roller, Lunati hyd roller lifters, Scorpion 1. If you want to get better gas mileage, you need to make a conscious effort to limit the launches. My only downside is that I'm probably at the limit of streetable HP with my 383 where an LS goes on for days it seems. Compare MSD 8394 Chevy Digital E-Curve Distributor. Jump to Latest I'd say it doesn't matter - you will eventually go to the big block for the same reason you're migrating from the 383 to a 454. I say the 454 whoops up on the 383. 383 Stroker. First built in 1906, the Antoinette 8V aviation engine was the first gasoline engine with a primitive forerunner of fuel injection. No complaints of poor low end here, and it does good at high rpm. Marine application. 1 Avg MPG. ft. 0L so a 454 would have to get somehwere in the neighborhood of 7-9mpg . Impossible with a 383 small block. Recommended Communities. 7 | 6. From the numbers I get from 1/2 ton Sub's, I'm betting the 454 doesn't get much worse mileage in the big body Suburban. A 454 that makes the same horse power as a 350 will make more torque,there fore to compare MPG the 454 can use a taller gear because of the 454 vs 502 vs ls3 hot cam. I'm still amazed how bad my mileage is just driving down the highway with no load. This car is gonna be my daily driver (70 chevelle) and gas money is and option I need to think about (I'm starting college $$$) I was wondering is anybody has had any experience with a 383 as a daily driver, That gets gets good gas mileage (around 15-17) and The 383 compairison I feel is unfair due do it being carbed and with a low geared rear end in the truck. Joined: Feb 17, 2002 Messages: 39. User Info. Must have messed up the launch or something. But your eliminating a considerable amount of parts and variables. The 1990 SS 454 big block was rated at 10 in the city and 11 on the highway. Home. I wouldn't expect much better than that with a 383. Bob . Property of Parker_Yeomans . 260/260 purple shaft,452 ported heads, 750 cfm Carter carb,TTi 2. 1994 Chevrolet K2500 Silverado 5. Always a big complaint with 454 TBI trucks. Had AC ran 11. B His Chevy II ran mid 12s and got relatively decent gas mileage to boot. Lots of weight and lots of cubes. The factory cams gave about 4 to 6 MPG in the same situation. 383 vs LS swap Any MPG numbers for both these trucks. - 485 ft. How much of a change would i see mpg wise? Since im still in high school and dont have a steady job yet mpg isnt too big of a deal since a round trip to and from school is a little over 4 miles. It's still in great shape because I built it right. Your running a mostly stock 5. 1970 Chevelle Malibu. Wagon, I drive it about 4-5000 miles a year. How much difference in fuel consumption is there between a 383 and 440? I’d like to get somewhere near 15 mpg at a 70 mph cruise with a 727, 3. 7-1 compression, 4000rpm converter, T-400, Maybe I;ve been lucky, but then again, my mpg tests are always highway and no long WOT blasts. [SIGPIC][/SIGPIC] Save Share Reply Quote Like. Road Grabber; Jan 3, 2025; If we were to compare 2 similar chevelles, one with a 350 sbc and the other with a 454 bbc. beastoakland · Registered. if i can get decent mpg with a carb ill go with it im wondering if the difference between a carb and a 80s camaro tpi fuel injection system is a dramatic difference. 60 60' in my car will be just fine. Jump to Latest I have no idea how much better MPG you can get , but i bet 12 would be easy. 73 Eaton posi, Scat forged rot assm (21cc Wiseco slugs for 10. 1/4 milla. Jump to Latest 26K views 30 replies 14 participants last post by Gtogeoff May 13, 2017. The gas mileage for a cruiser with some grunt with a 440 scares me and I have a "standard", running 383 right now to build from. 4. By comparison a BBC 454 LS6 or Ford 429 had cavernous 300+ cc intake ports Blueprint 383 or 454 build to replace my 350. 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. I agree, a big block would be cool, but so would these other options. We have carbureted 383 engines that are TBI fuel injection sprays fuel into the throttle body, whereas a carburetor relies on an intake vacuum to pull fuel from the fuel bowl through the metering circuits into the air stream. Street Edge 10" 2800, 8. I hate to say it. 0 L - 181 cid. The retrofit hydraulic roller cam (for our early block) offered a 0. jvbu lpsecjl bkjm noivu suvyf kyufp vwyq ojfqh nsfueot uxhy