Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 and come in machined or

and come in machined or polished finishes to suit your application needs

They will mount anywhere in the engine to eliminate any clearance issues

Speedmaster serpentine belts are designed to keep your accessory drive operating properly

Whether it's a new build or just general maintenance Speedmaster has what you need to get out on the road

Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 and come in machined orSpeedmaster Harmonic dampers feature a bonding process which adheres the elastomer to the i. d. of the inertia ring and the o. d. of the hub, utilizing a strong adhesive along with an improved elastomer to create a much stronger bond. The inertia ring rotates harmonically with the engine and absorbs the torsion vibration from the rotating assembly at any frequency and RPM. It extends the life of crankshaft and bearing which allows the engine to