Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 Speedmaster bearings are engineered with

Speedmaster bearings are engineered with precision to provide superior quality

Ideal for use with capacitive discharge (CD) ignition systems

Slim line design for when space is at a premium

These high-quality mirrors feature glare-reducing glass

the increased diameter applies more clamping force on the second gear clutch pack

Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1 Speedmaster bearings are engineered withSpeedmaster 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