SBC CHEVY ATI SUPER DAMPER SFI HARMONIC BALANCER INTERNAL BAL. PART # 917781

SBC CHEVY ATI SUPER DAMPER, SFI RATED, INTERNAL BALANCE, 6.325" FOR SBC CHEVY 350, 383, 406, 427, 434 ENGINES. PART # 917781 Brand ATI Performance Products Manufacturer's Part Number 917781 Part Type Harmonic Balancers Product Line ATI Super Damper Standard Harmonic Balancers Engine Balance Internal Safety Rating SFI 18.1 Degree Markings Yes Degree Marking Range 360 Outside Diameter (in) 6.325 in. Harmonic Balancer Material Steel Harmonic Balancer Construction Elastomer Harmonic Balancer Finish Black zinc chromate Mounting Hardware Included No Quantity Sold individually. Notes Steel with inner shell. 6.00 lbs. 3-ring design. 1.500 in. wide. The patented ATI Super Damper standard harmonic balancers are designed exclusively for high performance engines. Inner and outer shells are available in aluminum or steel, and contain a steel inertia weight. The inertia weights have six (2-ring design) or eight (3-ring design) computer-machined grooves to retain the proper durometer O-rings (dyno tested for each application). Whether you race or just drive on the street, ATI harmonic balancers are the perfect choice. Features include:        Eliminates torsional crankshaft vibrations        Exceeds SFI 18.1 specs        Black zinc chromate finished        OEM equipment on a variety of crate engines        Tunable, re-buildable, and extremely efficient at all rpm        Laser-engraved 360° timing marks