My Cometic gasket failure

[norbs]

put the stacked gm shims on it with ge 1200, let it sit at least 3 days before you start it, and torque them at least once a day sitting. I have been using this for 2 years, with 27 psi boost and 1750 egt, on stock heads, with no head gasket problems. I think using the gaskets with the extrea holes, can lead to failures on stock heads, just my opinion.