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Review on πŸ”§ Spectre Performance 4699 Harmonic Balancer Bolt: Enhanced Engine Efficiency and Stability by Greg Baker

Revainrating 5 out of 5

Perfect for my 1990 Jimmy 4.3

I don't know why others have trouble with this. It's a little longer than my stock screw and the washer is a little thinner than stock. Overall, the Specter is slightly longer with its shim and fits well. I use Loctite, not the lock washer that comes with the kit. The cost is low only because a screw and washer is expensive.

Pros
  • Confident
Cons
  • Clean