7 inch BBC Harmonic Damper - External Balance
Shown with Flying Magnet Option
7 inch BBC Harmonic Damper - External Balance 7 inch BBC Harmonic Damper - External Balance Side View BBC Crank Trigger Kit Option PN #10003

BBC 7 Inch Harmonic Damper
(External Balanced)

Part# 104X
Only $470.00
Externally Balanced Harmonic Damper for High Performance Big Block Chevys with SFI 18.1 Rating for the highest quality. The 104X Damper features an all aluminum case design for light weight, stress-proof steel hub and 1040 steel inertia rings for durability. Wet clutch friction design style with 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
    BBC Crank Trigger Kit OptionBolt on a matching billet aluminum sensor bracket and mounting hardware, with either passenger (std) or drivers side mounting options.
  • 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
    Add dual keyways for Supercharged or Extreme Duty Applications. Requires double keyed crankshaft snout.


  • Outer Diameter: 7"
  • Weight: 9.7 lbs
  • For External Balance Applications Only
  • Exceeds SFI 18.1 standards and is marked on front with SFI Sticker, and on the rear with SFI number stamped into unit.