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One is a Derale and one is the one that came on my truck. I will also be using a Hayden HD / Truck fan clutch. Radiator is a stock replacement heavy duty.

I need pulleys. I am looking for a single groove crank and aluminum water pump pulley. I have been considering the CVF aluminum pulleys from Mancini but the size is not stock. Do they have an ill effect on cooling? Should I stick to looking for OEM pulleys for the best cooling? OEM w/p pulley =...