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Good afternoon all; What happens when the wrong exhaust manifold gasket is installed? I have a 1987 3.0 Mercruiser and have water in the oil, I started tearing down the engine and noticed the exhaust manifold was split in two. I started looking to purchase a new one and none of the ones from...

Good afternoon all and thank you in advance for the help. I have been a long time lurker on here and finally have a question that I could not find the answer to. I have a 1987 Mercruiser 3.0 140hp and a 1974 Mercruiser 2.5 120hp. I was wondering if I can put the 140 head on the 120 block? On...