ATI Performance Products 917065 - Big Block Chevy Steel Shell 7.074 OD Internal Balance OE

• Big Block Chevy • Steel Shell • 7.074" OD • Internal Balance • OE Front • 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).