Product details:

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). Chevrolet Camaro/Pontiac Firebird 5.7L. The patented ATI Super Damper is the only crankshaft damper designed exclusively for high performance Chevy engines. Features. Steel Shell. Internal Balance. Laser engraved 360 timing marks. Tunable rebuildable and extremely efficient at ALL RPM. OEM equipment on ZZ572 GM Crate Engines. Black zinc chromate finished. Size: 7.5 in.