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ted it sounds like the wisco pistons you are looking at are the same ones that are in my 440 short block.my pistons are so posed to 0.012 down in the hole. with a 0.039 head gasket and a 74 cc Indy head i am so posed to only have 10.5 compression. but the Wallace engine calculator says i will have around 12.2.




Mpar65, FWIW, Scott did a CR calcutaion with my pistons sitting .010 in the hole, a 039 head gasket, and figured a 74 CC chamber and came up with 11.09-1. When we actually milled the heads they cc'd at 64.6 cc's and he racalculated and we now have 12.05-1.

I'm not sure how my Pro Tru pistons compare with yours as far as vavle releif volume but I would think your problably in the 11-1 range.