No problems. Just trying to find a way to lower the compression ratio. Here is what I have:

4.030" bore
3.25" crank (331)
60cc combustion chambers
Pistons are all in the hole .007" to .009"
-14.2cc dished pistons
.039" gasket at 4.100" bore
9 psi Powerdyne supercharger
Have not chosen a cam yet

This works out to 9.04:1 compression ratio.

If I add .020" shims it drops it to 8.65:1 which I think would be great for a supercharger.

Should I just leave it alone and keep the 9:1 since my boost isn't that high?

Thanks!