Bolted on (a new to me) powerhead, a 1977 Evinrude (looper) 55 Hp. Great compression both cylinders, 135 psi. It started right away ran for a little while.... quit, would not start again. I know the carbs are good. Their off my 1977 55 hp. Johnson. Lots of white smoke coming out of the exhaust while cranking. I suspect water is finding its way into the cylinders. Thought it may be a blown head gasket... I split the head and there definitely was evidence of water there... as I slowly rotate the flywheel a bubble will form across the exhaust port inside the cylinder. Yet the head gasket appeared to be in good shape. So most likely coming in somewhere else. Any ideas on what the most likely location/culprit of water entering the cylinders may be?
