Just toying with some ideas on replacements for my dodgy looking manifolds. I've tried local shops and internet but replacement manifold for my engine seem to be almost impossible to find. I've tried Osco, Barr and Sierra but according to them my engine doesnt exist. Even if I could find a set, they are going to cost more than I paid for the boat so I was thinking about alternatives.<br />This are my thoughts so far...If I use an auto manifold I could hook it up to some SS tubing and exit through the stern. I'd need to block of the old exhaust exit to stop water coming back though the upper casing and fit some exhaust flaps and transom flanges to the ends of the pipes but that would take care of the exhaust gas. Thinking about the heat problem I could take the water flow from the thermostat and feed it though some flexible copper pipe wrapped around the SS exhaust pipe to create a water jacket/heat exchanger and then discharge the hot water either down through the old exhaust casing or direct into the the SS exhaust. I'd need to extend/remodel the engine cover to fit the new exhaust and possibly wrap the whole manifold exhaust/cooling pipe assembly in some of that asbestos tape. Sounds too simple especially as I could propably do the whole thing for about half the cost of a new set of marine manifolds (even if I could get them)<br />Your comments please 
