Thermostat
I had a marine mechanic come over to take a look and this is what we found.
The thermostat that is installed does not look correct and I was to purchase another thermostat for the 470 that looks like it will do its job. The new thermostat part numbers match up with the newer, aluminum manifolds.
From what we see, the part number of the thermostat installed is the correct part number but it does not look like it will redirect the coolant to the heat exchanger.
The mechanic said my setup is unusual because the thermostat does more than one function. It lets water go to the heat exchanger and closes the hole the goes back to the engine.
I will see on Saturday during a test ride...
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