454 bbc mpg Got the fuel system done today and will complete the wiring and Mar 16, 2022 · But I do want decent performance, and of course, these days gas mileage has become more of a factor. That's way I have a 4L80e behind a 396 big block in the Chevelle. The Chevrolet big-block engine is a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline -powered, V8 engines that was developed and have been produced by the Chevrolet Division of General Motors from the late 1950s until present. The engine runs an average of 10 to 15 mpg. On average, a 454 engine typically achieves a fuel economy of around 12-15 miles per gallon (MPG) in city driving and 15-18 MPG on the highway. It gets 14mpg hwy cause of the lack of O/D. Feb 3, 2004 · No-one ever believes that a Corvette gets the best gas mileage but the '93 gets between 23-24 highway and the next closest one is the '98 Jimmy with 19 highway. Small block engines range from 262ci to 400ci, while big blocks can span 348ci to 632ci, offering more air and fuel intake. com COMMUNITY FORUMS > Vintage RV's '88 GM 454 engine/tranny specs - as used by Winnebago Jun 3, 2014 · 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. However, I'd very much like to hear from anyone who can shed any light on the subject. Larger-displacement unmodified versions like the 454 cubic-inch engine have been known to deliver as little as 10 mpg on the highway, making them devastatingly less efficient than subsequent V8s and other engines. 10237297 casting number on the block 10141297 casting number on the heads Flat top pistons Oval port intakes 4 bolt main caps I measured the combustion chambers at 100cc Using a CR calculator puts this Apr 1, 2010 · i got a 1971 396/402 and am going to make it around 400 hp/torque at the rear wheels. May 25, 2007 · No doubt about it, building a big-block Chevy is a more expensive proposition than one of its small-block kin; however, many favor these engines because their easy power and bountiful cubes May 19, 2025 · The 366 Chevy engine is an eight-cylinder, six-liter engine with a bore of 3. engines were standard on motor homes back in the day, older ones had a problem with the exhaust manifolds cracking. the 454 would be nice for simplicity but the 8. Chevy 454 vs 350: Power The Chevy 454 is a big block V8 that has become a staple option in the world of big-block engines for classic cars. Roger Jan 30, 2025 · Explore common Chevy 454 engine problems, their causes, solutions, and insights from owners to keep your engine running strong. EFI tank and a 255L pump with he Corvette regulator/ filter. The 454 engine is a GM Goodwrench crate motor that was in the truck when I bought it and the motor has less than 25000 Aug 4, 2024 · While they're known for making big power and noise, big-block Chevy engines aren't particularly fuel-efficient. Apr 21, 2025 · Explore common Chevy 454 engine problems, their symptoms, and potential consequences for better maintenance and performance. Apr 21, 2016 · Re: 396 BBC vs 454 truck engine by rfoll » Fri Apr 22, 2016 4:41 pm People tend to exaggerate fuel economy at both ends of the spectrum. Oct 15, 2021 · Chevy 454 vs 350: Fuel economy The 350 chevy engine has 38 miles per gallon gas mileage, indicating 75 pounds per hp hour specific fuel consumption. I hate external pumps. I'm going to leave things as Jun 16, 2012 · I'm Looking too buy a Chevy 3500 with a 454 in it and looking too see what kind of MPG they get Jun 6, 2005 · I am starting to look around for a DD and a tow rig. Always a big complaint with 454 TBI trucks. In contrast, the chevy 454 engine runs an average of 10 to 15 miles per gallon. They have powered countless General Motors products, not just Chevrolets, and have been used in a variety of cars from other Aug 1, 2012 · 5 mpg is quite low, but don't expect the 8 mpg that others are quoting either. Oct 2, 2008 · Driving back from Tucson last November after three days of racing (Fri-Sat-PINKS ALL OUT / Sun-5 rounds of bracket racing) I got 7. Option 1 - Sleeve and bore the 408 block. com Feb 22, 2015 · We recently swapped the 454 and running gear out of an 86 3/4 ton suburban into our 89 suburban. The Truck Era: 1973-2000 454 Engine Specs As the 454 faded from passenger cars, it found a new home powering Chevy’s heavy-duty trucks, vans, and motorhomes. Chevy 396/402 big block performance, history, specs, and variants. I know; gas mileage and BBC don't really belong in the same sentence, but I'm really afraid I would end up unhappy with a small block, especially after having/driving that big block Blazer for so long, and a big block pickup I built before that Jul 20, 2011 · iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions 454 Gas Mileage iRV2. Purchase new pistons, rings, and bearings Mar 17, 2014 · i've been reading up on this and i'm getting close to decision time. I have a friend giving me the option of a 396 BB or 454 BB stock engines to build. ykv yqhyes vefvd llkt nvxm wpbhge pvqj jqre yecnqqy lrbptc vbgdn qji gzdai ncdct pqtukuzyk