ATI Super Damper SFI 18.1 Harmonic Balancer - 6.325 in OD - Black - Internal Balance - Small Block Chevy 917411 4101MEDBK * Will not work with

* Will not work with Chevelle*

Same quality as AFCO coil-over springs

134a or R-12 Systems

The bolt on A-Arm tube section lets you carry additional lengths for use with just one shaft

1961-1980 Ford F-350

ATI Super Damper SFI 18.1 Harmonic Balancer - 6.325 in OD - Black - Internal Balance - Small Block Chevy 917411 4101MEDBK * Will not work withThe patented ATI Super Damper is the only damper designed exclusively for high performance engines. Eliminates torsional crankshaft vibrations Exceeds SFI 18. 1 specs Laser engraved 360 timing marks Black zinc chromate finished Inner and outer shells are available in aluminum or steel contain the steel inertia weight. The inertia weight has six (2 ring design) or eight (3 ring design) computer machined grooves to retain the proper durometer O rings