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NHRA rules require an SFI-approved harmonic balancer for all cars running 10.99 and quicker in the quarter-mile. Right before the motor installation, we realized that we specified the wrong non-SFI balancer with our Scat rotating assembly during our engine build. A quick call to Professional Products set us straight, as they swapped it out for one of its SFI-approved PowerForce Plus units (PN 90008), which lists for $176. View Related Article
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