LS1 7.480 Harmonic Damper - SFI

The ATI Performance LS1 7.480 Harmonic Damper with SFI 18.1 certification is a premium serpentine super damper engineered for GM LS-series engine builds. This internally balanced harmonic balancer features a 7.480-inch outer diameter and integrates an AC pulley, making it a complete solution for high-performance and street applications that demand reliable crankshaft damping and accessory drive capability.

Built from steel and finished in black oxide, this damper absorbs torsional vibration that naturally occurs during combustion cycles in LS engines. The SFI 18.1 rating confirms it meets Specialty Equipment Market Association standards for safe operation in high-RPM and forced-induction environments, making it suitable for naturally aspirated, supercharged, and turbocharged LS powerplants. The internal balance design eliminates the need for external counterweights, simplifying installation and maintaining factory crankshaft compatibility across a wide range of LS variants.

This harmonic damper is essential for LS engine swaps, restorations, and builds where OEM or aftermarket dampers may not meet performance demands or current specifications. Builders working on 5.3L, 6.0L, 6.2L, and other LS displacements benefit from the precision engineering that reduces harmful vibration, extends crankshaft life, and improves overall drivetrain longevity. The included AC pulley provides direct belt-drive integration for alternators and air conditioning compressors, reducing the need for additional adapter hardware.