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Really there shouldn't be any issues at all with an underdrive crank pulley. Yes it slows the accessories down but at the point you see a voltage drop, (which is rare on these cars) you can put an overdrive alternator pulley on so you never see a loss in charge. Also, guys who install camshafts into the car shouldn't have an issue either. Typically with a camshaft you are raising the idle over the amount you are underdriving the alternator.
At the end of the day, guys have been throwing these pulleys on LS1's since the motor came out back in '97. I personally have never seen an issue that was the result of an underdrive pulley being on the car. If there was any chance that a mod would hurt the performance or integrity of the car itself, we would not offer it.
Jon
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