pressure
you may want to see if that engine has pressure relief valves, thay are usually plastic, look like a hat profile and have a spring. I have seen them melt. As workingprogress mentioned with the Tstats. Thos pressure relief valves are important, if they are removed or stuck in open , sometimes not enough pressure is built up to force water up ,to the upper parts of the engine. I have experienced this on my yamaha. I did have a 93 evinrude spitfire, but i cant remember for sure if it has pressure relief/poppit valves.
BTW is the McManus of McManus Powerboats?
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I heard it on the coconut telegraph..........
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