ATI Performance Products 917776 - 6.32" Harmonic Damper for GM LS1

• GM LS1 • Steel Shell/Steel Crankshaft Hub • 6.325" OD • 1.483" Crankshaft • Internal Balance • 3-Ring 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 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).