Thread: 350 vs 454 in mileage

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I should just stick to my small block.

bolt on some better heads and a performance torque conveter.

I have lots of years to work up to a monster motor.

I just want to be fast enough to out accelerate the local competion.

Here is my deal. About 10 to 12 mpg is about right My 72 GMC jimmy, 4x4, 305, big cam (too big) holley 600, about 9 mpg. my 78 chevy blazer 454, 4x4 big cam (again, too big) with a holley 750 double pumper about 8 mpg, with a carter 650 came as an edelbrock about 11.5 mpg. see, so not always bigger is better on a daily driver.just watch for what type of carburator you are going to use. street carter or edelbrock, for hot driving (racing, sand dunes etc. holley will make a big difference on performance and reaction. hope that helps....

a big block may be even better with the right carburator (a carter or an edelbrock ) keep a small cfm carb if daily driver, now if Hot driving (racing, sand drag or asphalt ) use a holley for better performance and reaction. also on a millage search keep your engine at or below 2000 rpm at all times. Hope this helps.

Ok 454ci limited to 4500rpm.

3.73 gears with an edelbrock 600cfm carb.

wanting lots of low to mid.

tranny shifts at 4400rpm.