5.875″ Mod Motor Harmonic Balancer 8 Rib, 10% Underdrive #803


SFI 18.1 Harmonic Balancer for 2V, 3V, 4V Mustang GT & Cobra with 8 Rib drive & 10% Underdrive Pulley. The “Mod Motor” balancers are designed to fit 4.6L 2V, 3V and 4V engines as well as 5.4L 2V engines.

Underdrive dampers are for use on Naturally Aspirated engines making 600hp or less. For engines making over 600hp, please use a standard diameter damper for greater dampening capability.

  • Diameter: 5.875″
  • Weight: 5.0 lbs
  • Exceeds SFI 18.1 standards and is marked on front with SFI Sticker, and on the rear with SFI number stamped into unit.
  • Underdrive Balancers are designed for use on N/A engines producing less than 500 hp.  For forced induction applications or engines making more than 500 hp we recommend the standard diameter or larger Balancers.

6 in stock