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ATI Damper - 6.78" - Aluminum - 6 Groove - No A/C - 3 Ring - 10% UD (1998 - 2002 Camaro / Firebird) ATI917277

ATI Damper - 6.78" - Aluminum - 6 Groove - No A/C - 3 Ring - 10% UD (1998 - 2002 Camaro / Firebird) ATI917277

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Item#:
APPATI917277
Price: $437.39
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UPC:
800157029691
Availability:
Regularly stocked product
LTL:
N
MPN:
ATI917277
Product ID:
361285
Proposition 65:
N
Category:
Engine Components>Crankshaft Dampers
Core:
N
Clearance Item:
N

ATI Damper - 6.78in - Aluminum - 6 Grv - - No A/C - 3 Ring - 10 Percent UD - LS1 / LS2 - F & V Body (1998 - 2002 Camaro / Firebird) - ATI917277

Lightweight Underdrive Harmonic Damper for LS1 & LS2 Engines

The ATI 6.78-inch Aluminum Super Damper (part ATI917277) is a 10% underdrive, 3-ring, 6-groove harmonic balancer designed for LS1 and LS2 engines in both F-Body (Camaro/Firebird) and V-Body (GTO) platforms. This “No A/C” configuration eliminates the air-conditioning drive section for a more compact, performance-focused setup that frees up horsepower and reduces parasitic drag.

Performance Highlights

  • 10% underdrive ratio reduces parasitic load and helps free up horsepower
  • 6.78-inch diameter aluminum shell lowers rotating mass for quicker revs
  • No A/C pulley section for race-inspired simplicity and weight reduction
  • 3-ring damper design ensures accurate harmonic control across the RPM range
  • Ideal for naturally aspirated street and track LS builds

Quick Specs

  • Outer Diameter: 6.78 inches
  • Material: Aluminum
  • Design: 3-Ring, 6-Groove Pulley
  • Configuration: No A/C – 10% Underdrive
  • Engine Compatibility: LS1 / LS2
  • Application: F-Body (Camaro/Firebird), V-Body (GTO)
  • Part Number: ATI917277

Why Choose a 10% Underdrive Damper?

By slightly slowing down accessory drive speed, a 10% underdrive damper reduces power loss to the water pump, alternator, and power steering—resulting in measurable horsepower gains at the wheels. ATI’s precision 3-ring design keeps vibration in check while providing the performance edge serious LS enthusiasts demand.

Frequently Asked Questions

What kind of power gains can I expect?

Results vary, but typical LS1/LS2 setups see 5–10 horsepower gains from reduced accessory drag with a 10% underdrive damper.

Can I run factory belts with this setup?

No. Because this is a No A/C underdrive configuration, you’ll need a shorter belt that matches the revised pulley layout.

Is this damper suitable for daily-driven cars?

Yes. It’s ideal for street cars looking for sharper throttle response and slight power improvement while maintaining accessory reliability.

Will this damper work with aftermarket supercharger systems?

This version is designed for naturally aspirated setups. For supercharged builds, use an ATI damper made for your specific blower drive system.

Does this damper require any tuning changes?

No tune is required when installing an underdrive damper. It doesn’t affect fueling or timing parameters.

Vehicle Fitment

  • 1998 Chevrolet Camaro LS1
  • 1999 Chevrolet Camaro LS1
  • 2000 Chevrolet Camaro LS1
  • 2001 Chevrolet Camaro LS1
  • 2002 Chevrolet Camaro LS1
  • 1998 Pontiac Firebird / Trans Am LS1
  • 1999 Pontiac Firebird / Trans Am LS1
  • 2000 Pontiac Firebird / Trans Am LS1
  • 2001 Pontiac Firebird / Trans Am LS1
  • 2002 Pontiac Firebird / Trans Am LS1
  • 2004 Pontiac GTO LS1
  • 2005 Pontiac GTO LS2
  • 2006 Pontiac GTO LS2

Contact Beefcake Racing

Beefcake Racing offers the full line of ATI Super Dampers and LS performance components. Email sales@beefcakeracing.com or call 1-855-827-7223 for expert product advice and fitment support.

CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov