my friend is trading a turbo kit for an ls bottom end with pct pitsons (i know the pistons are very domed) and hes going to run a gsr head but me and him know that is way way to high compression to run on a daily, does anyone know of a company who makes very very thick headgaskets to lower the compression or anything else i can do to lower the compression without getting into the bottom end?

 

Cometic makes thicker gaskets.