The closer you can put the piston to the cylinder head w/o contact during operating temps, the less chance on detonation you will have, as well as a more turbulent combustion chamber.
Scott

 

Actually, a .015" cut off the heads combined with a .030" head gasket would hit 10.25 on the nose, if, average deck height is .005 and actual chamber volume is 85cc. So, if the OP wants to hit 10.25 static, he would need to measure chamber volume and equalize, verify deck height, do the math (1cc=.007232") and deck the heads appropriately. That is the main reason why I suggested it was not worth the time and expense; whatever compression the OP picks up will not register on the butt dyno.

You guys need to remember that static CR is just a number; the operating motor never sees static compression. Corrected/dynamic CR and CCP are the critical numbers. The OP should be looking at cams with earlier intake close events that will increase corrected CR and CCP. A corrected CR of about 9.3 and CCP between 185 and 190psi are good conservative targets for a street build. A cam like the TMan 555Torkster, IMHO, would be a better choice, as would the Andrews 57 or even the 48.

 

djl - you da man!

 

Scott,

What effect do the valve pockets in the tops of the piston have on this? I measured .003" in the hole at TDC and used a .036 MLS headgasket (replaced a .045" MLS headgasket that came with the kit) but when I clayed the pockets, the intake valve only penetrated the clay about 1/2 of the pocket depth and the exhaust valve didn't even dent the clay. I am running Crane 296-2 cams. Does this make a difference in terms of detonation potential?