Strange problem I have run in to. The boat I am working on I discovered water in four cylinders (combustion chamber) Normally I would think blown head gasket or possibly cracked head. However the four cylinders that have the water are directly across from each other on opposite sides of the engine. It seemed strange and highly unlikely that both heads would crack or blow both gaskets in the same place at the same time.... Anyways, I started thinking intake gasket so I replaced it and well same thing happened again. On friday I am going to tear it down again and check the heads ,gaskets, etc all that fun stuff. I also see no water on the dipstick. but there appears to be moister inside the valve cover which I will confirm on friday.Anyways.. in the meantime if there is anyone out there who might be able to shed some light on this for me that would be awesome... I mean I myself have not seen heads or gaskets blow at the same time but that doesnt mean it hasent happened.... Oh its a 1988 chevy 350 ci OMC I/O. sorry dont have the S/N on hand but I can get it if needed. Thanks In advance.