ATI Performance Products ATI917276 Super Damper Harmonic Balancer Underdrive - 6.78 LS1/LS2 10%

The ATI Performance Products ATI917276 Super Damper is a high-performance harmonic balancer specifically engineered for GM LS1 and LS2 engines. This 6.78-inch diameter damper features a 10% underdrive configuration with air conditioning compatibility, designed for F-body and V-body (VT-VZ) applications with the factory offset.

Key Features:

• 6.78-inch outer diameter aluminum construction for reduced weight
• 10% underdrive pulley ratio optimizes accessory speeds and reduces parasitic power loss
• Dual serpentine belt grooves: 6-groove and 4-groove configuration
• 3-ring design with computer-machined grooves for O-ring retention
• Patented full-captured inertia ring system eliminates harmful torsional crankshaft vibrations
• Exceeds SFI 18.1 specifications for racing and high-performance applications
• Laser-engraved 360-degree timing marks for precise engine timing
• Black zinc chromate finish for corrosion resistance
• Single keyway design for proper crankshaft alignment
• Tunable and rebuildable for long-term durability

Unlike OEM elastomer-style dampers that can deteriorate over time, the ATI Super Damper utilizes 70-durometer O-rings and a steel inertia weight to provide consistent dampening performance across all RPM ranges. This technology is proven on dragstrips nationwide and comes standard on many GM performance crate engines. The underdrive configuration is ideal for naturally aspirated and turbocharged applications, helping prevent accessory over-spinning while improving engine response and freeing up horsepower.