ATI Damper for LS1/2/3/6 97-13 Y Body - 6.78in AL 6/4 Groove 10 Per UD

ATI Harmonic Damper for LS1/LS2/LS3/LS6 (1997–2013) — 6.78" Aluminum, 6/4 Groove Brand: ATI High-performance harmonic damper engineered for GM LS-series engines (LS1, LS2, LS3, LS6) used in 1997–2013 Y-body applications. Precision-machined aluminum construction and optimized 6.78" diameter deliver reliable vibration control for street, strip, and performance builds. Key Features Exact Fit: Direct replacement for 1997–2013 Y‑body LS engines. Aluminum Design: Lightweight 6.78" aluminum housing for improved throttle response and reduced rotating mass. 6/4 Groove: Six-groove crank pulley with four-groove accessory configuration for compatibility with factory and aftermarket belts. 10 Perimeter UD: 10-perimeter underdrive specification for controlled accessory speeds and accessory drive tuning. 3-Ring Construction: Durable multi-ring assembly to dampen crankshaft harmonics and extend engine life. Benefits Reduces harmonic vibration for improved engine longevity. Supports high-RPM performance and aggressive tuning. Compatible with A/C equipped and most accessory setups. Precision balance for smooth operation and reduced NVH. Ideal for: Enthusiasts upgrading to underdrive pulleys, performance rebuilds, or replacing worn factory dampers on LS1/2/3/6 platforms.