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The rotating weight would be too negligible to matter. Bigger bore would help unshroud but would matter only a little. Id say the only difference that would matter is the 400 block is stronger and would be better that it isn't .060 over.



Where is the 400 block in this post? i see either a 496 based off of a .060+ 383 block or a 499 based from a 440 block...

I agree though that i doubt you see any real difference in performance based on the 2 engines mentioned using the same top end components.