Spin tested to 12,500 rpm for one hour to comply with SFI Spec. #18.1, so when your racing needs require SFI certification, the PRO/SPORT Harmonic Damper is ready for the track.

Machined to exacting tolerances and assembled using pressure bonded elastomer technology of tried and proven design for optimum damping performance! The outer inertia ring is retained by a robust retention plate secured by 6 high tensile bolts to ensure maximum safety of the product. Extremely accurate and easy to read permanently engraved timing marks.

Features:

• Meets SFI Spec. #18.1
• Spin tested to 12,500 rpm
• Fully machined from high quality carbon steel
• Retained outer inertia ring
• 60° of permanently engraved timing marks (40° on SB Ford models)
• Pressure bonded elastomer
• Accurately balanced
• Removable counterweights on externally balanced models