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    Closed cooling option?

    On my '77 Cobalt, would I benefit any by changing to a closed cooling system? This is a fresh water boat. Would I just add a radiator, fan, different water pump, t-stat, then run the headers out the back? It seems something would have to be changed in the out drive too maybe. I think it's an...
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    Cobalt merc. 250.

    I was given, (by my father-in-law), a very nice 1977 Cobalt. It is the 5.7L 250hp 350 ci. He was a physician, and bought it new. I love the boat because it is somewhat of a classic with the teak wood trim, and is heavy, so it rides like a 24ft. + boat on the local lakes even though it is a...
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