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6 rib serpentine pulley designed to increase grip
even while the transmission is still installed in the vehicle
They're designed with performance in mind
Nothing lasts forever
circle track and drag racing
Chevy GM LS 6.780" 10% Underdrive Harmonic Balancer Damper SFI 18.1 6 rib serpentine pulley designedSpeedmaster 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
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