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Hi Fleetwin: Sorry for the late reply. I am also restoring a 1953 (we thing, builders placard missing) Mercury Boat Co. Ski Tug. This is a small mahogany utility with a Gray Marine inboard. No relation to the outboards co. or the auto co. The engine went back into the boat Sunday and it has taken my attention until it is aligned etc. I have a video of the Johnson RDSL-21 spitting water from the ‘exhaust water’ port and will try to get it ‘up’ somehow so it can be viewed. Do you happen to know what temp the cylinder are supposed to run at? They seem to get hot quickly maybe too hot? I have only run the engine for a few minutes at a time with long periods between those ‘runnings’. Thanks Tom Alexander