The HKS belt is kevlar coated, so it is stronger.
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.
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.but with the same service intervals.
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Unless you have increased your rev limit, or are running high lift cam shafts.
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it would probably be a waste of money
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Plus.
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.
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.from memory when Bob Hatton had a pair of the HKS pulleys tested they were significantly out of balance, and needed a lot of correction.
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On that basis if you
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looking for after market pulleys I would probably avoid them.
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