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this being a race only piece. using same cam, heads, compression, everything. how would a 496 4.31x4.25 compare to a 499 4.375x4.15. i am sure the smaller bore would hurt flow some, but would have a lighter rotating weight. so what does everyone think?



the way the question is worded makes it pretty generic. your not offering any specifics for the build regarding the heads, cam, compression, intake manifold, etc. etc. or for the car it would go in. if this is a build your actually considering, the answers would be better if you added some information.

machine shop owner and engine builder