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    Mercruiser 260 Closed Cooling Overheats at 3k RPM

    Hello, I need some advice from the iboats community because I am completely stumped! I have a GM350 / Mercruiser 260, Alpha One, closed cooled system in a 1979 Century 26ft. The exhaust manifolds are the log type with 180 deg exit exhaust elbows. The problem I am having is the engine overheats...
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