ATI Performance Products ATI918844 Super Damper Harmonic Balancer Underdrive - 5.5 LS1/LS2 25%

The ATI Super Damper ATI918844 is a high-performance harmonic balancer designed specifically for LS1 and LS2-powered GM F-body and V-body vehicles. This precision-engineered damper features a 5.5-inch outer diameter aluminum and steel construction with a 25% underdrive pulley configuration that reduces parasitic drag on accessories, freeing up horsepower to the wheels. The elastomer-based damper effectively eliminates harmful torsional crankshaft vibrations across all RPM ranges, making it ideal for both street performance and racing applications.

Key Features:

• 5.5-inch (139.7mm) outer diameter with lightweight aluminum/steel construction
• 25% underdrive design reduces accessory load and frees up horsepower
• 6-groove serpentine pulley for OEM drive systems (no A/C compatibility)
• SFI 18.1 certified for NHRA and IHRA competition use
• Laser-engraved 360-degree timing marks for precise engine tuning
• Black zinc chromate finish for corrosion resistance
• Single keyway design with internal balance specification
• Fully rebuildable and tunable for extended service life
• Elastomer construction for superior vibration dampening at all RPM levels
• Mounting hardware included (requires 1.25" longer crankshaft bolt)

This harmonic balancer is engineered for 1998-2002 Chevrolet Camaro and Pontiac Firebird, as well as 2004-2006 Pontiac GTO models equipped with LS1 or LS2 engines. Note: This underdrive damper will not fit with factory air conditioning pulley and requires shorter serpentine belts. ATI Super Dampers are patented and proven to exceed SFI 18.1 specifications while delivering improved reliability and balance over OEM dampers.