Comp. change in points

I am sure this was asked before, but i looked and can't seem to find it. How much of a change is it when you go up or down for every .010 of gasket thickness on a 4.375 bore fat head. Don't know the volume or CC's of the gasket. Say you start with 10.7 with a .081 gasket. Hope I worded it right. Thanks Don

 

when we were putting together our new combo for this year, i calculated all of that for our deal. 4.375 bore with a 4.380 gasket in a 173cc fuel head, a .010 thinner gasket changed the compression .32 of a point. so you roughly lose 1/3 of a point for every .010 thicker gasket you try. so in your case a .070 gasket should give you right at 11 to 1. disclaimer.....these are MY findings hope this helps.