to the coolant I've added some 'water wetter', and a 13psi Radiator cap. Yesterday i drove to two cruise in shows a round trip of about 55 miles. I didn't take the interstate highway. I went on the parallel surface highway with traffic lights. between red-lights the speed was about 40-50mph. One or two drops of of coolant were under the over flow where I parked at the cruise in from the super heat after each engine shut down. And, the 13psi cap is a step in the right direction(thanks, Willie). With the 7psi cap it was shooting out a cupful after each shutdown. I'm thinking of adding an over flow reservoir. If for no other reason, just to monitor how much coolant is escaping, and when. I think it means the radiator is working good. It just needs more air flow at lower speeds. Perhaps, a multi blade fan (6 to 9 blades) to replace the 4 blade fan.