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02-09-2008 #1
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- Join Date
- Jan 2008
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- 79
t56 mpg question 454 bbc vs ls1/ls2
okay guys so im planning out my project here and i definately want to use a t56 since it would give me more gears to work with so i could still get decent mpg on the highway. but my real question is once you start building a lsx engine for 600-700hp how much would the gas mileage differ from a 454 at the same horsepower? i mean not wanting a exact idea but would it be drastically different as in more than 5 mpg difference. i know that stock vs stock the lsx engines are more efficient but once you start building one how much of a difference is their to a bbc if mated to a t56 tranny.
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