When an engine stops, some cylinders contain pressure while neither valve is open. All of that very hot cylinder pressure can go into the cooling system via a crack in a head gasket.
Well. This engine should have the 302 heads on it and I have wondered if maybe it has a crack. Unfortunately I will be leaving g to go to Wyoming this coming Monday and I don’t have time to do the top end of the engine right now. It will have to wait till I get back. May just have to park it for now. I’ll keep y’all posted on what it turns out to be. I’ll definitely do a pressure test this afternoon and post the results.
