ATI 918620U Super Damper 6.78" 10% UD w/AC for Chevy LS7/LS3 Dry Sump Engines

Vehicle Fitment

• 2006-2013 Chevrolet Corvette C6 Z06 (LS7 7.0L V8, dry sump)
• 2010-2013 Chevrolet Corvette C6 Grand Sport (LS3 6.2L V8, manual transmission, dry sump)
• 2014 Chevrolet Camaro Z/28 (LS7 7.0L V8, Gen 5)

Fitment Notes

• Dry sump engines only -- LS7 and LS3 Grand Sport manual w/ dry sump require LS7-style damper
• With A/C -- non-removable A/C pulley included
• 10% underdrive -- requires shorter serpentine belt
• Internal balance engines only
• Mounting hardware not included

Features

• 10% underdrive -- reduces parasitic accessory drag, increases crank power
• Patented ATI Super Damper design -- developed exclusively for high-RPM performance engines
• 3-ring elastomer design -- eight computer-machined grooves retain proper durometer O-rings
• Dyno-tested O-ring durometer for each application
• O-rings rebuild-able -- new O-rings restore damper function
• SFI 18.1 certified
• Black anodized aluminum outer shell / steel crankshaft hub
• 8-rib main serpentine pulley + 4-rib A/C pulley
• 360° computer-controlled laser-engraved timing marks
• Black zinc chromate shell finish

Specifications

• Part Number: 918620U
• Series: Super Damper Serpentine Series
• Outside Diameter: 6.78" (172.2 mm)
• Underdrive: 10%
• Pulley Grooves: 8-rib main / 4-rib A/C
• Shell Material: Aluminum
• Hub Material: Steel
• Engine Balance: Internal
• Ring Design: 3-ring
• Safety Rating: SFI 18.1
• Finish: Black anodized / black zinc chromate
• Weight: 8 lbs.
• Quantity: 1

Included Components

• 1x ATI Super Damper assembly with integrated A/C pulley

Product Description

The ATI 918620U is a Serpentine Series Super Damper for Chevrolet LS7 and LS3 dry sump applications -- including the C6 Corvette Z06, C6 Corvette Grand Sport (manual/dry sump), and Gen 5 Camaro Z/28. The 10% underdrive reduces parasitic power loss from accessory drive systems, freeing additional crank horsepower for high-RPM performance. The patented 3-ring elastomer design uses eight computer-machined grooves retaining proper durometer O-rings dyno-tested specifically for each application, exceeding SFI 18.1 requirements. Units are rebuild-able by replacing the O-rings.

Features an 8-rib main serpentine pulley with integrated non-removable 4-rib A/C pulley, 360° laser-engraved timing marks, and aluminum shell with steel crankshaft hub in a black anodized/zinc chromate finish. Dry sump applications only. Mounting hardware not included. SFI 18.1 certified.