Almost ready to pull trigger

[THEFERMANATOR]

Or it could be a sticking check ball if it has the spring loaded valves in the T-stat housing. As for teh drop in RPM's, was it only under load or did it still do it in neutral? And that boat has been for sale for quite awhile now MANY times. It's been listed here 3 or 4 times that I know of over the last few years. She's a nice looking boat, but I always thought it looked too clean as well.