not much to clog on the exhaust bottom end of things…
have to tried pulling the PH and feeding water in the entry point of the water tube and then checking to see where and how much water exits the engine cavities …back out to the outside world ? check the thermostat flow channel seems it should come out as fast as it goes in if proper cooling is expected from the water pump.
if all is ok… recheck the impeller and pump assembly & cavities below
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