I have a 1979 OMC 140-HP 3.0-181(GM).I'm having a problem because the wter and oil mixed. I changed the head gasket and cylinder was tested and no<br />crack at all, the exhaust manifold gasket is new.<br />Can anybody give me any idea how to fix the problem. If I will change the 20-yrs. old intake manifold do you think it will solve the problem.<br />I don't have problems about the power it runs good. thank you for your response.