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  See more parts for Buick Regal
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ACT HD/Perf Street Sprung Kit Buick | Chevrolet | Oldsmobile | Pontiac 1964-1982 - GM6-HDSS

Upgrade Your Ride with the ACT GM6-HDSS Clutch Kit

If you're a proud owner of classic American muscle like the Chevrolet Camaro (1970-1981) or Pontiac Firebird (1970-1981), the ACT GM6-HDSS Clutch Kit is a game changer for your performance needs. This kit combines ACT's most popular Heavy Duty pressure plate with a robust street disc, ensuring you get the best of both worlds: reliability and performance. Whether you're hitting the streets or the track, this clutch kit is designed to meet the demands of serious driving enthusiasts.

Why Choose the GM6-HDSS?

ACT's Heavy Duty pressure plates feature an exclusive diaphragm design that increases clamp load while reducing deflection, which translates to longer clutch life and better performance. Each diaphragm undergoes a meticulous four-stage heat-treating process, ensuring it can handle the heat of spirited driving without breaking a sweat.

The Performance Street disc is crafted from premium organic materials with high copper content, enhancing heat transfer and durability. With a steel-backed lining, these discs are built to withstand the rigors of both street and race conditions. Plus, the reduced marcel allows for quicker shift actions, making your driving experience smoother and more enjoyable.

Installation and Features

  • Light to moderate pedal effort for a comfortable driving experience
  • Smooth, positive engagement with minimal gear rattle
  • Engineered for longer friction life, thanks to ACT's unique diaphragm design
  • 100% clamp load tested and dynamically balanced for reliable high RPM performance
  • Recommended for both street and race applications

Technical Specifications

  • Clutch Disc Diameter: 11 in (280 mm)
  • Input Spline Quantity: 26
  • Input Shaft Diameter: 1.125 in
  • Pressure Plate Type: Heavy Duty
  • Torque Capacity: 709 ft/lbs (22% increase over OE)
  • Product Weight: 30.5 lbs
  • Release Bearing Included: Yes
  • Pilot Bearing Included: Yes
  • Grease Included: Yes
  • Alignment Tool Included: Yes

Fitment

This clutch kit is compatible with the following vehicles:

  • Buick Regal (1973-1977)
  • Chevrolet Bel Air (1971-1975)
  • Chevrolet Biscayne (1971-1975)
  • Chevrolet Camaro (1970-1981)
  • Chevrolet Chevelle (1964-1977)
  • Chevrolet Corvette (1970-1982)
  • Chevrolet Impala (1971-1976)
  • Oldsmobile Cutlass (1971-1973)
  • Pontiac Firebird (1970-1981)
  • Pontiac GTO (1971-1973)

Customer Feedback

One Chevrolet Camaro owner shared, "I installed the GM6-HDSS kit on my 1978 Camaro, and the difference is night and day. The pedal feel is just right, and the shifts are crisp and quick. It's like driving a new car!"

Another Pontiac Firebird enthusiast noted, "This clutch kit has transformed my driving experience. I can feel the extra grip, and it handles my V8 power without any issues. Highly recommend for anyone looking to upgrade!"

Installation Instructions

  • For detailed installation instructions, CLICK HERE

Other Part Numbers:
ACT #actGM6-HDSS

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
1973-1977
 Buick Regal
1971-1975
 Chevrolet Bel Air
1971-1975
 Chevrolet Biscayne
1970-1981
 Chevrolet Camaro
1964-1977
 Chevrolet Chevelle
1970-1982
 Chevrolet Corvette
1971-1976
 Chevrolet Impala
1971-1973
 Oldsmobile Cutlass
1970-1981
 Pontiac Firebird
1971-1973
 Pontiac GTO

ACT Banner

ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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