Well come to the Cometic head gasket party. Steve ran his car around for a few weeks, pressurizing the coolant system with the commetic. It does a VERY bad job of sealing, but wont "blow" like a traditional gasket, just lift, pressurize system, and seal back up, it will even kick out pretty comp test numbers for you.
Our best guess was it was the cometic gasket, or the head studs/bolts. What setup are you running to keep the head glued to the block? What prelimnary install steps did you take? Copper Spray? Presealed cometic? Deck'd head? Deck'd Block?
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