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So what if its not the motor that came in the boat originally? When I got the boat the block was cracked and it now has a different 5.7. All the bolt on parts are the same as any other 5.7. If I a

I have raw and coolant water mixing and I believe I have a defective exchanger. Where can I find one to fit my boat? It mounts to the top of the intake at the thermostat. Water passage goes from there into the bottom of the heat exchanger, then hoses from there to other points on the engine