Rick,
I must apologize, I decided to try a 140 thermostat just for the hell of it changed it today. I didn't take the boat out of the marina but for the initial test the gauge ran at about 170 instead of 185. I'm happy with this but don't know why the motor calls for a 160 if this works thats the bottom line I guess. One manifold still runs much hotter than the other but maybe I should accept that as the norm. I have yet to take it out and run it to see if the dieseling is still there.
