07-02-2012, 05:16 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,415
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Not Ranked
You need a harmonic balancer to take out the harmonics of a rotating assembly...which even internally balanced assemblies have harmonics.
The SFI rating just shows that it's been approved by SFI guidelines, which is a standard for most racing sanctions.
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