head gasket thickness-compressed

I use .050" but some reports are as in post #2. So use .048 and you will be as good as you are going to get. Being off by +/-.003" is going to change your CR results by roughly +/-.05 point.

The .039" is for the Felpro 1008 head gaskets.

Also, I add 1 cc to either the chamber or eyebrow volume to account for the volume in the gap between piston crown and cylinder down to the top ring.