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...agree w/Rick. The March pullies have one thing in mind, reducing parasitic draw. They accomplish this by under-driving the water pump/alternator w/a larger diameter water pump pulley and/or a smaller crank pulley. I had the March pullies on mine early on experienced overheating probs. I ended up switching to a Epay'd sourced larger diameter OEM crank pulley bringing me to a 1 to 1 ratio. That with inlet and outlet shrouding brought me back where overheating now is a thing of the past, totally.

Dave