Hawks Motorsports offers our clients this 870 2009 Chevrolet Corvette ZR1 LS9 6.2L 11-Rib 10% Overdrive Harmonic Damper, SFI 18.1, Innovators West. This performance damper is designed for the supercharged LS9 engine in the 2009 Corvette ZR1 and increases crankshaft accessory-drive speed by 10 percent.

When you're leaning on an LS9, keeping the crank happy matters just as much as making boost. This 10% overdrive damper gives the blower a little more spin without having to start swapping around the upper pulley. It's a smart move for a boosted setup where you're looking for more blower speed while keeping the factory-style 11-rib drive. Built for guys who actually use the throttle, this is a serious piece of hardware for a serious LS-based powerplant.

The 870 uses a 7.800-inch diameter, 11-rib design and is built with an aluminum outer shell, steel hub and steel inertia ring. The damper uses Innovators West's wet-clutch friction damping design and is built to exceed SFI 18.1 requirements. (innovatorswest.com)

KEY FEATURES:

• Part number: 870
• Innovators West LS9 harmonic damper
• Designed for 2009 Corvette ZR1 LS9
• 6.2L supercharged LS9 V8
• 10% overdrive
• 11-rib accessory-drive configuration
• 7.800-inch diameter
• SFI 18.1 certified/exceeds SFI 18.1 standards
• Aluminum outer shell
• Steel hub
• Steel inertia ring
• Wet-clutch friction-style damping
• Designed for high-performance and high-RPM applications
• Factory-style LS9 accessory-drive configuration

FITMENT APPLICATIONS:

Chevrolet Corvette ZR1

• 2009 Chevrolet Corvette ZR1 — 6.2L LS9 Supercharged V8

Engine:

• Gen IV LS9
• 6.2L Supercharged V8

Accessory Drive:

• 11-rib

INSTALLATION NOTES:

• This listing is for one Innovators West 870 harmonic damper.
• Verify the vehicle is equipped with the LS9 engine and 11-rib accessory drive before ordering.
• This damper provides 10% crankshaft overdrive, increasing accessory and supercharger speed.
• Verify belt length and routing with the increased pulley ratio before installation.
• Inspect the crankshaft snout, keyway and timing components before installation.
• Use the correct harmonic damper installation procedure and tooling.
• Follow manufacturer torque specifications.
• Verify pulley alignment and belt tracking before starting the engine.
• Increased supercharger speed may require supporting fuel, cooling and calibration changes depending on the overall combination.
• Do not install or modify the damper until fitment has been confirmed.
• Professional installation is recommended.