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if you're smart,you're gonna replace the engine with a complete new engine...
manifolds and risers-5yrs max-flushing has no bearing here.
trust me,the advice i gave is the best...
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in 20yrs,i've never seen an engine fail directly due to being raw water cooled
i've never seen an engine fail due to lack of flushing either...most engines fail due to exhaust manifolds an risers leaking.i've seen the engine block break-where the starter mounts-the hi torque starters will actually shear this area off,when the motor hydro locks...
i've seen many boat owners with the exact same prolem,some opted for the "reman long block"-when all was said and done,the money spent was almost the same as a new complete engine...just some good advice...
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Well if he had shut the engine down and stored it for the winter not knowing that he had a problem, then it would cause major problems with the cylinder sitting with water in it all winter long which in turn would probably warrant engine replacement. However this doesn't sound like the case, he has found the problem right when it happened which should pretty much be treated as if the boat had sunk (pickling, oil change water removal etc.) If the boat had sunk you wouldn't just automatically assume that the engine was bad and just replace it, you would get the water out and get it running. I'm not a parts changer, I like to be sure that the part that I'm changing is actually bad, just throwing parts at something is the easy thing to do and requires no skill. If you wrecked your truck and it was fixable you wouldn't just throw it away and buy a new one you would fix it. As far as corrosion goes, on a completely raw water-cooled engine, the engine is made from the same materials as the manifolds, which is cast iron. The manifolds go first due to heat and they are thinner than the block, then the heads will go next. Usually the water passages get ate up and are so large that the head gasket will no longer seal it. Ask me how I know this?
My father use to own a Marina and use to work on boats. I have been turning wrenches with him since I was 10YRS old; I'm now 40. The last thing that he want's to do is winterize it with moisture still present, if that happens, then he most likely will need an engine replacement.