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OK, so if you build a low deck 540 with 4.5 bore an 4.250 stroke and use CNC ported 440-1 heads with 382cfm flow at .800 and 345cc intake volume w/ right roller cam,

Or build a 557" with 4.5 bore and 4.375 stroke, same heads, choose proper cam, how much difference in the powerband between the 2 strokes?

Thoughts?

Arnie

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I would guess at around 300-500rpm peak HP and TQ...maybe?
HP does not always go up with more cid...even if you use a larger cam to try to make up for the cid, the intake system and exhaust system will determine more or less just how much effect the difference in cid makes.
I wouldn't think it would be worth the extra $$$ for that .125 stroke going from a 470cid Arnie!

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