If you are considering a once in a rare occasion to drop the boat in salt water then I would say go for it and don't worry. If you are going to drop it in salt water once a month and the rest of the time in fresh then I would say no problem, but you should rinse everything (including the trailer) with fresh water as soon as possible after hauling the boat out. If salt water is going to be where you operate the boat then you should get a fresh water cooling system. Ideally, you buy the boat that way (I know it is an option with Correct Craft, and I would assume any manufacturer could provide it) but you can add it later. Basically, fresh water cooling uses a heat exchanger, which is sort of like a car's radiator. Water from the lake/ocean is pumped up to cool the heat exchanger, and then is dumped into the exhaust to cool it. The water that ciculates through the engine is cooled by the heat exchanger and thus is a closed system. A "budget" system just has the engine cooling go through the heat exchanger. A more delux system also cools the exhaust manifolds with the closed system and the only part of the engine that salt water touches is the exhaust elbow where the water is dumped in. If you already had a boat and were to add fresh water cooling I would go ahead and run the manifolds you have. Expect them to rust out in a year or two and then replace them with ones that you can isolate the main mainfold cooling from the outlet.
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