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The p.o. said that he had a head gasket job done, and the upper gasket (valve cover?
Do a compression test.
No valves on a 2 stroker.
Check the oil in the lower.
The grey gunk might not have anything to do with it??
It could be gunk from the de-carb.
The last pic is
it don't have anything to do with the current problem but it looks like in the pics that the motor is setting too low on the boat..almost as if you have
Thanks for the information you have all saved me many hours of labor and aggravation. Do both springs and valves need to be in the thermostat housing