Should point out that the boat engine has a few minor differences from the car engine, mainly coolant ports in the block so the head gasket is different. There are probably a few other subtle differences also. I know this because I wanted to put a rebuilt boat head on a car block, fortunately asked the question first. From the outside the engines are however essentially the same. They are good though, designed to run at high revs, so in theory should last (even) longer than a car engine.