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Old 07-17-2005, 09:11 AM
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Burgs Burgs is offline
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Join Date: Nov 2004
Location: Grand Rapids, Mi
Cobra Make, Engine: Hurricane 427S/C, KC/Pond aluminum 427/482 SO, TKO 600
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Yes, an underdrive crank pulley spins the alternator and water pump slower, but usualy only creates problems with the alternator charging when running "big" stereo components. The advantage of the underderive crank pulliey is more HP/TQ, quicker revs.