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Rich, I don't know the answer right off, but I know that you don't want to speed the engine fan up to the point that it cavitates and stops moving air efficiently (aka - the fan pulley and crank pulley ratio have to be in sync) - so definitely worth looking into and I know that there is a lot more info on this in the 911 forum (from people like J. Walker, Bruce/flatsixpack, etc.).
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