I would like to thank everyone on the forum for your good advice. I recently installed a Hardin SS raw water pump, the engine was still running hot and it took a lot of rpms to prime it.
Hardin suggested changing the impeller even though it was new. This helped a bit. I then thought about removing the thermostat and went to this forum for advice. In the end I removed the innards of the old thermostat and used it as a restrictor plate. This works well here in the Bahamas where water temp is 80 deg. year round. Now running between 140-160f
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Lake St. Clair, Lake Huron, Lake Erie, Lake Oakland