BBC 7in Harmonic Damper SFI

ATI 917060K BBC Super Damper Harmonic Balancer 11.5 lbs (Internal Balance). 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).