Speedmaster LS Underdrive Harmonic Balancer SFI

The Speedmaster LS Underdrive Harmonic Balancer is an SFI-rated crankshaft damper built for GM LS-series engines. It reduces vibration at the front of the crankshaft, and its underdrive pulley design slows accessory speeds. This can free up some power and cut parasitic loss from the water pump, alternator, power steering pump, and other belt-driven parts.

Key Features:

• SFI-rated design: Built to meet SFI safety specifications for performance and racing use.
• Underdrive pulley: Slows the accessory drive to reduce parasitic loss and belt-driven load.
• Harmonic damping: Absorbs crankshaft torsional vibration to help protect the bearings and the rotating assembly.
• LS engine application: Made for LS-based engine builds, for street, strip, and track use.
• Multiple configurations: Available in several variants to suit different LS engine setups.

Speedmaster makes performance engine parts for hot rodders, racers, and engine builders. This underdrive harmonic balancer is a dependable, affordable choice for LS engine builds and upgrades. Choose the variant that matches your engine and accessory drive setup.