ATI Performance Super DamperThe 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 Tunable, rebuildable, and extremely efficient at ALL RPM Laser engraved timing marks The ATI Serpentine Super Damper contains grooves for serpentine belts machined into the outer damper shell. The dampers come standard with 6 outer grooves
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