ATI Damper 7.48in Aluminum 8/4 Groove 10% Underdrive OEM A/C 3 Ring (20062013 Corvette LS7 & LS3) ATI918620U
Underdrive Super Damper for Corvette LS7 & LS3 Engines
The ATI 7.48-inch Aluminum Super Damper (part ATI918620U) is built for 20062013 Chevrolet Corvettes running the LS7 or LS3 V8 engine. This 10% underdrive damper reduces accessory drag for increased horsepower while retaining full OEM A/C compatibility. Its 8/4-groove pulley design supports factory belt alignment, while the 3-ring internal damper provides exceptional harmonic control for high-RPM performance. Precision-machined from billet aluminum and SFI 18.1 certified, the ATI918620U is a proven choice for both street and track LS builds.
Performance Highlights
- 7.48-inch outer diameter maintains compact fitment with improved damping performance
- 10% underdrive ratio reduces parasitic loss and frees up horsepower
- Dual 8/4-groove pulley setup compatible with OEM A/C and accessories
- 3-ring internal construction ensures maximum harmonic vibration absorption
- Billet aluminum design provides durability with reduced rotational mass
- Perfect for street and track LS7/LS3 engines seeking improved response and balance
- SFI 18.1 certified for motorsport-grade safety and performance assurance
- Fully rebuildable for long-term precision and reusability
Quick Specs
- Outer Diameter: 7.48 inches
- Material: Aluminum
- Pulley Type: Dual 8/4 Groove
- Drive Ratio: 10% Underdrive
- Design: OEM A/C Compatible 3-Ring Super Damper
- Certification: SFI 18.1
- Applications: 20062013 Corvette LS7 & LS3 Engines
- Part Number: ATI918620U
Why Choose ATIs 10% UD Super Damper for LS Engines?
The ATI918620U Super Damper is designed for LS owners who want the perfect blend of power gains and reliability. The 10% underdrive pulley reduces accessory speed to reclaim lost horsepower while keeping your A/C fully functional. Combined with 3-ring internal damping technology, it eliminates harmful crankshaft vibration for smoother performance, reduced wear, and improved high-RPM stabilityideal for both Corvette Z06 and Grand Sport applications.
Frequently Asked Questions
How much power does a 10% underdrive pulley free up?
Typically, you can expect gains of 812 horsepower by reducing parasitic drag from belt-driven accessories.
Will my factory A/C still work?
Yes. The ATI918620U is fully compatible with OEM A/C systems and factory belt configurations.
Is it suitable for forced induction?
Yes. Its SFI 18.1 certified and proven to handle high-RPM and boosted LS applications reliably.
Is the damper rebuildable?
Yes. Like all ATI Super Dampers, this unit is fully rebuildable for long-term performance and durability.
Vehicle Fitment
- 2006 Chevrolet Corvette Z06 7.0L LS7
- 2007 Chevrolet Corvette Z06 7.0L LS7
- 2008 Chevrolet Corvette Z06 7.0L LS7
- 2009 Chevrolet Corvette Z06 7.0L LS7
- 2010 Chevrolet Corvette Z06 7.0L LS7
- 2011 Chevrolet Corvette Z06 7.0L LS7
- 2012 Chevrolet Corvette Z06 7.0L LS7
- 2013 Chevrolet Corvette Z06 7.0L LS7
- 2008 Chevrolet Corvette 6.2L LS3
- 2009 Chevrolet Corvette 6.2L LS3
- 2010 Chevrolet Corvette 6.2L LS3
- 2011 Chevrolet Corvette 6.2L LS3
- 2012 Chevrolet Corvette 6.2L LS3
- 2013 Chevrolet Corvette 6.2L LS3
Contact Beefcake Racing
Beefcake Racing is your trusted source for ATI Super Dampers and high-performance LS engine upgrades. For fitment or ordering assistance, email sales@beefcakeracing.com or call 1-855-827-7223. Our experts can help you choose the best damper for your LS-powered Corvette.
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