ATI Damper 6.78in Aluminum 6-Groove 10% Underdrive 28T 8mm HTD Rear Drive 3 Ring (19972013 Corvette & Chevy SS / 20082009 G8) ATI917289
Lightweight 10% Underdrive Damper with 8mm HTD Rear Drive for Corvette, Chevy SS & G8
The ATI 6.78-inch Aluminum Super Damper (part ATI917289) is engineered for 19972013 Corvettes, the Chevy SS, and the 20082009 Pontiac G8. Featuring a 10% underdrive ratio and a 28-tooth 8mm HTD rear drive pulley, this damper is perfect for builds running additional belt-driven accessories such as superchargers or fuel pumps. The 3-ring aluminum design reduces rotating mass for faster revs while maintaining the vibration control ATI is known for.
Performance Highlights
- 10% underdrive helps free up horsepower by reducing accessory drag
- 28-tooth 8mm HTD rear drive supports auxiliary belt-driven components
- 6-groove front serpentine layout maintains OEM accessory alignment
- 6.78-inch aluminum shell minimizes rotating mass for quicker throttle response
- 3-ring damper construction provides reliable harmonic control at all RPM levels
- Built for street performance, forced induction, and road course applications
Quick Specs
- Outer Diameter: 6.78 inches
- Material: Aluminum
- Design: 3-Ring, 6-Groove Pulley
- Rear Drive: 28T 8mm HTD
- Underdrive Ratio: 10% (Approx.)
- Applications: 19972013 Corvette, 20142017 Chevy SS, 20082009 Pontiac G8
- Part Number: ATI917289
Why Choose ATIs 10% Underdrive HTD Drive Damper?
ATIs 10% underdrive dampers are designed for enthusiasts seeking horsepower gains without sacrificing reliability. The addition of an 8mm HTD rear drive makes this damper ideal for custom belt-drive systems, supercharger drives, or mechanical fuel pump applications. The lightweight aluminum shell offers fast acceleration, smooth operation, and race-level precision damping.
Frequently Asked Questions
Whats the benefit of the 10% underdrive?
It reduces the speed of engine accessories like the alternator and water pump, lowering parasitic drag and freeing up measurable horsepower typically 510 HP depending on setup.
What is the 28T 8mm HTD rear drive used for?
The rear 8mm HTD pulley is commonly used to drive auxiliary components like fuel pumps, vacuum pumps, or supercharger systems.
Is this damper safe for high-RPM use?
Yes. ATIs 3-ring dampers maintain torsional stability through the entire rev range, making them suitable for both street and track LS applications.
Can this damper be installed on an LS2 or LS7 engine?
Yes, with proper hub selection. The damper is designed for the LS family and compatible across multiple variants when matched with the correct ATI hub.
Is this damper pre-balanced?
Yes. Every ATI Super Damper is factory-balanced and ready for installation without additional machine work.
Vehicle Fitment
- 1997 Chevrolet Corvette LS1
- 1998 Chevrolet Corvette LS1
- 1999 Chevrolet Corvette LS1
- 2000 Chevrolet Corvette LS1
- 2001 Chevrolet Corvette LS1 / LS6
- 2002 Chevrolet Corvette LS1 / LS6
- 2003 Chevrolet Corvette LS1 / LS6
- 2004 Chevrolet Corvette LS1 / LS6
- 2005 Chevrolet Corvette LS2
- 2006 Chevrolet Corvette LS2
- 2007 Chevrolet Corvette LS2
- 2008 Chevrolet Corvette LS3
- 2009 Chevrolet Corvette LS3
- 2010 Chevrolet Corvette LS3
- 2011 Chevrolet Corvette LS3
- 2012 Chevrolet Corvette LS3
- 2013 Chevrolet Corvette LS3
- 2014 Chevrolet SS LS3
- 2015 Chevrolet SS LS3
- 2016 Chevrolet SS LS3
- 2017 Chevrolet SS LS3
- 2008 Pontiac G8 GT / GXP LS2 / LS3
- 2009 Pontiac G8 GT / GXP LS2 / LS3
Contact Beefcake Racing
Beefcake Racing is your trusted source for ATI Super Dampers and high-performance components. For product questions, fitment help, or custom setups, email sales@beefcakeracing.com or call 1-855-827-7223. Our team of enthusiasts is ready to help you make the most of your build.
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