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I've owned my Catalina 30 for 20 years and I'm the second owner of this boat and it's Atomic4. The boat was built in 1978. I noticed rust on the plugs on #'s 2 & 3. The engine was still running fine. I pulled the head. Looks like the gasket failed between the water jacket holes and the exhaust valves on #'s 2 & 3. The gasket appears to be original, paper type, so I'm also assuming this was the first time the head has been removed. My question is regarding a disparity between water jacket holes in the block and the head. There seems to be 5 holes that have been blocked off in the head. I may have answered my own question as I've just looked at a MM photo of a late model aftermarket head and those hole just aren't there. What's the history on this lot?