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You dont have any leaks around the impeller right?

Was the old impeller in good shape or was it wore completely down?

It sounds like the previous owner had the same problem, and maybe was...

I would sure change out the thermostat and make sure that it is not clogged.

that was ample time to overheat, and if it would heat up to too hot in that time frame before you inspected and cleaned out the system, and you have now ran it and it didnt heat up like before, I...

How long after it warmed to 160 did it run?

Ok, so you changed the impeller, to no avail.

Your thermostat could be not opening, or not operating properly.

If you take the outlet hose off of the impeller housing, while your boat is in...