Well I don't know for sure which one did the trick, but thanks George for getting me started on the solution. Added factory Ac to my car and had heat problems with my new motor, 500HP. Added an aluminium rad, flowkooler pump, 160 stat, two 10" electric fans & a heavy duty clutch fan. Temp would still climb on hot days, especially in stop & go traffic. Did so research and changed my pulleys to AC versions. These overdrive the water pump fan. Massaged the divider plate to close the massive gap. Now on a 100 degree day in stop & go traffic with the AC on, temp never got over 185!
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