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  See more parts for Buick Century
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ACT HD/Perf Street Sprung Kit Buick | Chevrolet | Oldsmobile | Pontiac 1955-2005 - GM3-HDSS

ACT GM3-HDSS Heavy Duty Clutch Kit

Upgrade your driving experience with the ACT GM3-HDSS Heavy Duty Clutch Kit. This kit combines ACT's most popular Heavy Duty pressure plate with a premium Performance Street disc, designed to deliver exceptional performance on both the street and the track. Customers have praised its smooth engagement and reliability, making it a favorite among enthusiasts.

Features and Benefits

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

Technical Specifications

  • Clutch Disc Diameter: 10.5 in (266 mm)
  • Input Spline Quantity: 10
  • Input Shaft Diameter: 1.125 in
  • Torque Capacity: 629 ft/lbs
  • Product Weight: 22.1 lbs
  • Disc Material: Organic
  • Release Bearing Included: Yes
  • Pilot Bearing Included: Yes
  • Grease Included: Yes
  • Alignment Tool Included: Yes

Customer Feedback

Many users have noted the GM3-HDSS provides a noticeable improvement in clutch feel compared to stock setups. One satisfied customer mentioned, "The engagement is so much smoother, and I can really feel the difference during hard shifts." Others appreciate the durability, stating, "I've put this clutch through its paces, and it holds up like a champ!"

Important Notes

  • This kit is compatible with select GM vehicles featuring a 10 spline input shaft. Please verify fitment before purchasing.

Fitment Information

This clutch kit is suitable for the following models:

  • Buick Century (1973-2005)
  • Buick Regal (1973-1987)
  • Chevrolet Camaro (1967-1992)
  • Chevrolet Corvette (1965-1978)
  • Pontiac Firebird (1967-1992)
  • And several more GM models listed above.

Installation Instructions

For detailed installation guidance, please CLICK HERE.

Other Part Numbers:
ACT #actGM3-HDSS

Proposition 65

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

Vehicle
1973-2005
 Buick Century
1973-1987
 Buick Regal
1961-1972, 1975-1998
 Buick Skylark
1955-1975
 Chevrolet Bel Air
1958-1975
 Chevrolet Biscayne
1967-1992
 Chevrolet Camaro
1964-1977
 Chevrolet Chevelle
1962-1968
 Chevrolet Chevy II
1965-1978
 Chevrolet Corvette
1968-1987
 Chevrolet El Camino
1959-1976
 Chevrolet Impala
1973-1983
 Chevrolet Malibu
1970-1980
 Chevrolet Monte Carlo
1969-1979
 Chevrolet Nova
1965-1967, 1979-1981
 Oldsmobile Cutlass
1973, 1979
 Oldsmobile Omega
1967-1992
 Pontiac Firebird
1964-1966, 1970-1973
 Pontiac GTO
1979
 Pontiac Phoenix

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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