He had it winterized last year at a marina. Went to start it and it wouldn't turn over..pulled the plugs and got antiefreez out plug holes.. I don't know how they winterized it but can't figure out how coolent got in cylinders.They must run it through the engine cause they don't get all the water out. Last time it was apart the heads & exhaust manifolds were checked. Its a 4.3 engine I/O. I think the water and exhaust go out underwater by the prop?