2011 & Up Ford Coyote Engines with 20% OD Pulley Harmonic Damper

10 Rib 20% Overdrive Coyote Mod Motor Harmonic Damper with 6 Rib Std. Dia. Back Pulley

Part# 821
Only $575.00
Save $20 on #10205 damper install tool when purchased with Damper
10 Rib 20% OD Front Pulley, 6 Rib STD diameter back pulley SFI 18.1 damper for 2011-up 5.0L Coyote Mustangs. Designed for the Whipple Supercharger 10 Rib System.


  • 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.
  • #10205 - Damper Install Tool - Add $55.00
    Save $20 if you buy our Coyote / GT500 Install tool when you buy your damper!


  • Diameter: 7.884"
  • Weight: 8.3 lbs
  • 6 Rib Standard Back Pulley
  • 10 Rib 20% Overdrive Front Pulley
  • Exceeds SFI 18.1 standards and is marked on front with SFI Sticker, and on the rear with SFI number stamped into unit.