GM LS 7.480 Harmonic Damper - SFI

The ATI Performance GM LS 7.480 Harmonic Damper – SFI is engineered for serious LS engine builders who demand reliability under extreme conditions. This harmonic balancer eliminates destructive crankshaft vibration that can compromise engine longevity and performance in high-output LS platforms. Built for both street and competition applications, this damper is essential when running elevated boost, aggressive cam timing, or sustained high RPM operation where stock dampening proves insufficient.

Constructed from a dual-material design featuring aluminum inertia rings bonded to a steel hub, the 7.480-inch outer diameter damper delivers superior vibration absorption compared to single-mass alternatives. The internal balance configuration integrates seamlessly with LS engines that factory-balanced for internal balance weights, eliminating the need for external counterweights and simplifying installation. SFI 18.1 certification ensures this component meets sanctioning body standards for drag racing and high-performance motorsports, providing peace of mind in competition environments where component failure carries both safety and investment risk.

This harmonic damper is compatible with all internally balanced GM LS-series engines, including LS1, LS2, LS3, LS7, and LSA variants commonly found in modified vehicles from Camaros and Corvettes to F-body and truck conversions. Installation requires removal of the crankshaft pulley and bolt; the ATI damper uses the factory crankshaft nose thread, making fitment straightforward for experienced DIY builders or professional shops. At 12.31 pounds with compact dimensions, it balances effective mass without creating packaging complications, and its black powdercoat finish resists corrosion during storage and use.