PowerBond Race Serpentine Underdrive SFI 18.1 Harmonic Balancer - 6.220 in OD - Black Powder Coat - Internal Balance - GM LS-Series 4031 In addition to designing our

In addition to designing our wide range of after-market headers and exhausts

Easy to grip screw on cap with o-ring seal

Severe Duty Super Starter: 3

For mounting applications where you have a thicker roof and require a thicker NMO mount up to a 1/2" thick

Bearings / Races / Seals

PowerBond Race Serpentine Underdrive SFI 18.1 Harmonic Balancer - 6.220 in OD - Black Powder Coat - Internal Balance - GM LS-Series 4031 In addition to designing ourProduct Description: Harmonic Balancer Race Serpentine Underdrive 6. 220 in OD SFI 18. 1 Steel Black Powder Coat Internal Balance GM LS Series Sold Individually PowerBond produces steel harmonic balancers that are designed to outperform conventional harmonic balancers without the weight penalty of many competitive balancers.