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I don't think the head gasket or exhaust valve hanging open is off the table yet. There is minimal combustion pressure on the manifold when the valves are seating properly. Exhaust gases are merely pushed out by the piston on the exhaust stroke (note: well AFTER combustion has occurred). For high pressure combustion gases to escape it has to happen at TDC which is when the valves are supposed to be sealed. This is where the compression test may point us in a direction.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
Last edited by ndutton; 09-17-2019 at 06:41 PM.
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