Anyone know if the Mark 4 head gasket is any different then the Mark 5 or 6 head gasket? Take a look at the pics cyl. #4 piston melted. look at the gasket the engine builder used on it and how it is blocking the water cooling hole and how the other pics show they are unblocked. This is a mark 4 502 bbc original M.ercruiser engine
namba860
Anyone know if the Mark 4 head gasket is any different then the Mark 5 or 6 head gasket? Take a look at the pics cyl. #4 piston melted. look at the gasket the engine builder used on it and how it is blocking the water cooling hole and how the other pics show they are unblocked. This is a mark 4 502 bbc original M.ercruiser engine
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I ordered an original Mercuiser gen 4 head gasket to lay over the deck and see. I got the piston out and the wrist pin is beat out of it so Im going to assume detonation. The plugs have good color so I know it wasnt lean. I just find it awfully coincidental that the piston melted next to that restricted hole.
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