- Eliminates torsional crankshaft vibrations
- Exceeds SFI 18.1 specs
- Laser engraved-etched timing marks
- Black zinc chromate finished
Inner and outer shells are available in aluminum or steel contain the steel inertia weight. The inertia weight has six (2-ring design) or eight (3-ring design) computer machined grooves to retain the proper durometer O-rings (dyno tested for each application).