well, like they say, if it ain't broke, fix it til it is
R45 plugs should be OK .... maybe valves too tight? should be a bit noisey, like a good sewing machine .... how are you seeing the 180/210, got an aftermarket gauge? I always ran 160's in a 235, they'll run cold if you let them and the stat sets the minimum temp, I'd be surprised if it ran an actual 180 with no stat, if it did you have cooling system issues, rad or pump - have you checked it with a good infrared thermometer? maybe the rad is gumming up? maybe it's just too hot in FLA?
Bill
