Mike,Todd's build sheet says the pistons are .008 in the hole @ TDC..Fel Pro 1009 head gasket,with compressed thickness of .039..volume as 9.9 cc's. The cam at that time was a Scott Brown solid with 252/244 duration,with a 112 LSA,and ICL of 107. He's got the CR listed as 10.211. How much,if any..would this Comp cam change the "original" compressional ratio,when he put it together? Thanks for ALL your responses,Mike! I REALLY appreciate! Forgot to mention that the bore is actually a .040 over...4.360"