My 340 in my 66 developed issues :-(

SGBARRACUDA said

Good head gaskets? You have a head surface or deck that ain't flat. If they were installed properly, torqued properly, it ain't the gaskets fault.

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I don't know man... I know I torqued it right and I know the decks are true. It's not my first engine, I'm as baffled as anyone! The guy at the machine shop said he thought the gaskets I used would be fine... If I had to do it again I'd spend a couple more bucks for the stronger gaskets.