LOL, I cant believe a random message like this was never replied to before now. only 13 years later. To answer it, with 17psi and some detonation, I lifted heads and was pushing some combustion into the cooling system with fel-pros. I believe I had a bit of head stud torque inaccuracies, and my heads were still stock on the combustion chamber side. I don't blame the gaskets, put it that way