I'm 70 % sure that the head is not cracked, or the head gasket is not bad, so im thinking of replacing the manifold on my inboard outboard 3 ltr. engine runs fine at higher rpm but really ruff at low idle; does anyone know about how the fresh water cooling works on this motor and why it would make more sence to replace manifold first? small amount of water is somehow getting into oil... thanks so much for your help
