The GM9-HDG6 pairs ACT's Heavy Duty pressure plate with a 6-pad, spring-centered race disc, sized for the LS1-equipped Camaro/Firebird/Corvette/GTO/Trailblazer SS platform. The Heavy Duty pressure plate uses an exclusive diaphragm design to raise clamp load and reduce deflection, with a four-stage heat-treated diaphragm and precision-stamped cover. The spring-centered race disc damps torsional vibration and resists failure under harsh use, trading softer engagement for faster shifting and added heat capacity.
Installation Instructions
Warranty
Specifications:
- Pressure plate: ACT Heavy Duty, increases clamp load approximately 20-50% over stock
- Disc: 6-pad, spring-centered race disc for harsher engagement and faster shifting
- Spring retainers use wraparound spring windows and thicker stampings for durability
- Recommended for larger clutch sizes needing added heat capacity
- Backed by ACT's one-year warranty
- Part Number: GM9-HDG6
Vehicle Applications:
- 1998, 1999, 2000, 2001, 2002 Chevrolet Camaro Z28
- 1998, 1999, 2000, 2001, 2002 Chevrolet Camaro Z28 SS
- 2003 Chevrolet Corvette 50th Anniversary Edition
- 2003 Chevrolet Corvette 50th Anniversary Edition Pace Car
- 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Chevrolet Corvette Base
- 2010, 2011, 2012, 2013 Chevrolet Corvette Grand Sport
- 1998 Chevrolet Corvette Indianapolis 500 Pace Car
- 2001, 2002, 2003, 2004 Chevrolet Corvette Z06
- 2006 Chevrolet Trailblazer SS
- 1998, 1999, 2000, 2001, 2002 Pontiac Firebird Formula
- 1998, 1999, 2000, 2001, 2002 Pontiac Firebird Trans Am
- 2004, 2005, 2006 Pontiac GTO Base
WARNING: This product can expose you to chemicals including carbon black, glass wool fibers, and silica, chromium, and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
FAQ
What does a Heavy Duty pressure plate change?
ACT Heavy Duty pressure plates use an upgraded diaphragm design that raises clamp load roughly 20 to 50 percent over stock, which reduces slip and extends clutch life.
What is a 6-pad, spring-centered race disc?
It's a race-oriented disc with spring-center construction to damp torsional vibration; it engages more aggressively than a street disc but shifts faster and handles more heat.
Which LS1-based platforms share this kit?
Per ACT's fitment data, the GM9-HDG6 covers the Camaro Z28, Firebird Formula/Trans Am, C5 Corvette, Trailblazer SS, and GTO for the model years listed in the vehicle applications above.
Is a flywheel included?
No, this kit includes the pressure plate and disc only; ACT flywheels for this platform are sold separately.