My sea water cooled 5.0L continues to overheat. My main problem is no water flow through the engine. I can put it on the hose in the driveway and water flows through it enough to keep it cool at idle speed. Out on the water it is a different story. I replaced practically every part: sea water pump, impeller, thermostat, circulation pump, exhaust manifolds, risers, etc. I don't believe I have a blockage anywhere. I have not taken apart the upper/lower unit (SX) but that will probably be next. What am I missing? Thanks
