I used cometic 0.40 with my Ls6 heads and it gave me a very good quench and bumped my compression to 10.7 to 1. If you go cometic be sure to buy some copper gasket spray and lightly spray them before you install them as everyone on lstech that has had a leak with these gaskets has installed them dry and I have not herd of anyone that has sprayed them with a leak including me and my brother.
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