6.75 inch Blower SBC Harmonic Damper w/BBC Crank Snout
6.75 inch Blower SBC Harmonic Damper w/BBC Crank Snout 6.75 inch Blower SBC Harmonic Damper w/BBC Crank Snout Side View SBC Crank Trigger Kit Option

SBC 7 Inch Super Duty
Blower Damper w/BBC Crank Snout

Part# 109
Only $495.00
This SFI 18.1 Approved Balancer is designed for High Boost Applications making over 1500 hp and features a BBC Crank Snout with 6 pulley mounting bolts for blower and other front driven accessories. It features all aluminum case design for light weight, stress-proof steel hub and 1040 steel inertia rings for durability. Wet clutch friction style precision machined harmonic dampening for street and race engines.


  • Flying Magnet Crank Trigger Option - Add $100.00
    Get rid of your separate Crank Trigger Wheel by integrating it into the Damper itself! - Saves on average about 9 Ounces over the MSD Crank Trigger Wheel.
  • Crank Trigger Bracket Option - Add $136.00
    SBC Crank Trigger Kit OptionBolt on a matching billet aluminum sensor bracket and mounting hardware with passenger (std) side mounting.
  • Crank Trigger Sensor Option - Add $65.00
    3/4-16 UNF Flying Magnet Crank Trigger Sensor - Direct Replacement for MSD #8276. Designed to work with Integrated IW Flying Magnet Balancer Option and Brackets.
  • Dual Keyway Option - Add $20.00
    The double keyway option requires that the factory or aftermarket crankshaft be removed from the engine and a second keyway cut into the snout of the crankshaft. DO NOT run a double keyed damper on a crankshaft without the double keys. Failure to the damper hub can happen without the supporting key in the broached keyway slot. The dual keyway option is for Supercharged or Extreme Duty Applications (typically over 750 rwhp). Without the double key modification your crankshaft in these high horsepower applications can lead to the failure of the damper hub and/or the single keyway which results in damage to the damper and the crankshaft snout.


  • Outer Diameter: 6.75"
  • Weight: 7.6 lbs
  • 6 Bolt GM Pulley Pattern
  • BBC Crank Snout Dimensions
  • BBC Pulley Register Dimensions
  • Exceeds SFI 18.1 standards and is marked on front with SFI Sticker, and on the rear with SFI number stamped into unit.