ATI Performance Products 918857 - Super Damper Harmonic Balancer

Outside Diameter 7.48" Material Aluminum/Steel Grooves 6 See the "DOCUMENTS" tab below for installation instructions. The patented ATI Super Damper is the only crankshaft damper designed exclusively for high performance Chevy engines. -Eliminates torsional crankshaft vibrations -Exceeds SFI 18.1 specs -Black zinc chromate finished -OEM equipment on ZZ572 GM Crate Engines -Tunable, rebuildable, and extremely efficient at ALL RPM -Laser engraved 360° timing marks -Inner and outer shells are available in aluminum or steel, and contain a steel inertia weight. This 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).