Having a problem with my 261 over heating since I installed a/c. It does fine while running at lower speeds, but when I'm running up over 75 MPH with the a/c on it will over heat. I'm going to install a 3 core aluminum radiator. I have that ordered. But, I also want to put a larger water pump pulley on to slow down the speed of the coolent. My theory being to give the coolent more time in the radiator to cool down. I have tryed different temp thermostats. Thinking to increase the size to 7 3/8" or a little larger if I can find one to fit to bolt pattern. Any suggestions?
