Boat Repair Questions? Ask a Marine Mechanic for Answers ASAP
Their is only 2 center main bearings. 2 vavles needed, The 4 valves(NNN) NNN-NNNNis at the side of the cilinder case where the carburators fit,NOT WHERE THE CENTER MAIN BEARINGS FIT!
For the upper and lower valves 437613 is no place in this engine.