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priobe - Those are pretty good flow numbers for the heads. It simply is the amount of cfm (cubic feet per minute) that the heads allow thru the chamber at the corresponding valve lift ( ie. .500 = 1/2 inch of lift).
A ".660'ish" gross cam lift is mightly excessive for a solid flat tappet and even pretty aggressive for a solid roller - what are you looking to do with it?
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