LS Truck & Trailblazer SS, 10 Rib – 15% Overdrive Harmonic Damper #866SD


SFI 18.1 Harmonic Damper for GM 2009-2015 LSX Gen 5 Camaro, GM 1999-2013 Trucks & 06-08 Trailblazer SS – w/ Crank Bolt. Features 10-Rib, 15% Overdrive Pulley. The 15% overdrive diameter is intended for race applications with an aftermarket water pump and pulley combo for increased clearance for the larger diameter damper (compared to the 10% OD #864 street damper). The 15% overdrive dampers come standard with the super duty hub for high horsepower combinations.

  • Diameter: 8.35″
  • Weight: 11.4 lbs
  • Exceeds SFI 18.1 standards and is marked on front with SFI Sticker, and on the rear with SFI number stamped into unit.
  • NOTE: The Super Duty Blower Hub option is a thicker hub that provides greater resistance to hub cracking under high power supercharged applications (750 rwhp and greater). This option includes a new custom made timing cover seal to adapt the oversized hub to a stock timing cover.


Double 3/16" Keyway Add On

Add an additional 3/16 Keyway to your Damper. Required the crankshaft to be machined for a second keyway 180* out from the original keyway. *Requires damper purchase. This is a labor option for new damper purchase only.

Crankshaft Pin Kit -GM LS Truck & Gen 5 Camaro #968

Crankshaft Pin Kit for GM LS Trucks, TBSS and Gen 5 Camaro's.

Designed for use with Innovators West dampers. Will not work with OEM or other aftermarket dampers.

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