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The 3.6 PSC pump doesnt use a replacement idler pulley and I believe it is the same PS pulley size.
 

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Sorry to Zombie this but the pulley suggestion (that came with PSC pump) has a larger diameter shaft bore size than the stock pump.
Im running the PSC big bore (w/o PSC pump) and would like more flow at idle but I can’t find a overdrive (smaller) pulley. I’ve read many discussions about it but I haven’t come across any press on to the stock pump solutions. Anyone have a suggestion?
 
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