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From what I've heard, a crank pulley is worth more than just 2 HP. Assuming you drop 4 lbs of rotating mass from the crank, you should gain closer to 8 HP. The alternator pulley I'd believe, but I've heard ~2.6 hp per 1 lb. of rotating mass removed from the crankshaft. Alternator pulleys are little anyways, so it'd be hard to subtract much weight from them.
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