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  See more parts for Buick Skylark
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ACT HD/Perf Street Sprung Kit Buick | Chevrolet | Oldsmobile | Pontiac 1959-1995 - GM4-HDSS

ACT GM4-HDSS Heavy Duty/Performance Street Sprung Kit

The ACT GM4-HDSS kit is engineered for those who demand reliability and performance from their clutch system. This kit features ACT's renowned Heavy Duty pressure plate and a Performance Street disc designed to enhance your driving experience on the street and at the track.

Pressure Plate Design

ACT's Heavy Duty pressure plates utilize an exclusive diaphragm design that significantly increases clamp load while minimizing deflection. This results in a longer clutch life and improved performance under stress. Each diaphragm undergoes a meticulous four-stage heat-treating process, ensuring durability and consistent performance. Precision cover stampings enhance rigidity, allowing for reliable engagement at high RPMs.

Performance Street Disc Features

The Performance Street disc is crafted from premium organic materials with a high copper content, optimizing heat transfer and durability. A steel-backed lining provides additional burst strength, while a reduced marcel design allows for quicker shift action. This combination ensures that the disc works seamlessly with the Heavy Duty pressure plate for enhanced strength and reliability.

Installation Notes

For installation instructions, please refer to the following link: Installation Instructions.

Specifications

  • Clutch Disc Diameter: 11 in (280 mm)
  • Disc Material: Organic
  • Input Spline Quantity: 10
  • Input Shaft Diameter: 1.125 in
  • Torque Capacity: 709 ft/lbs
  • Product Weight: 30.5 lbs
  • Pressure Plate Type: Heavy Duty
  • Release Bearing Included: Yes
  • Pilot Bearing Included: Yes
  • Alignment Tool Included: Yes

Fitment

The GM4-HDSS kit is compatible with the following models:

  • Buick Skylark 1967-1971
  • Chevrolet Bel Air 1966-1972
  • Chevrolet Biscayne 1966-1972
  • Chevrolet C/K 10 1969-1986
  • Chevrolet C/K 1500 1988-1995
  • Chevrolet C/K 20 1969-1986
  • Chevrolet C/K 2500 1988-1995
  • Chevrolet C/K 30 1969-1978
  • Chevrolet C1500 1994-1995
  • Chevrolet Camaro 1967-1970
  • Chevrolet Caprice 1966-1972
  • Chevrolet Chevelle 1966-1970
  • Chevrolet Corvette 1966-1970
  • Chevrolet El Camino 1966-1972
  • Chevrolet Impala 1966-1972
  • Chevrolet K5 Blazer 1975-1986
  • Chevrolet Nova 1969-1970
  • GMC C/K 15 1969-1978
  • GMC C/K 1500 1979-1986 & 1988-1995
  • GMC C/K 25 1969-1978
  • GMC C/K 2500 1979-1986 & 1988-1995
  • GMC C/K 35 1973-1978
  • GMC C/K 3500 1979-1986 & 1988-1995
  • Oldsmobile Cutlass 1965-1973
  • Oldsmobile Omega 1973
  • Pontiac Bonneville 1959-1960 & 1967-1970
  • Pontiac Catalina 1959-1960 & 1970
  • Pontiac GTO 1970

Other Part Numbers:
ACT #actGM4-HDSS

Proposition 65

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

Vehicle
1967-1971
 Buick Skylark
1966-1972
 Chevrolet Bel Air
1966-1972
 Chevrolet Biscayne
1969-1986
 Chevrolet C/K 10
1988-1995
 Chevrolet C/K 1500
1969-1986
 Chevrolet C/K 20
1988-1995
 Chevrolet C/K 2500
1969-1978
 Chevrolet C/K 30
1994-1995
 Chevrolet C1500
1967-1970
 Chevrolet Camaro
1966-1972
 Chevrolet Caprice
1966-1970
 Chevrolet Chevelle
1966-1970
 Chevrolet Corvette
1966-1972
 Chevrolet El Camino
1966-1972
 Chevrolet Impala
1975-1986
 Chevrolet K5 Blazer
1969-1970
 Chevrolet Nova
1969-1978
 GMC C/K 15
1979-1986, 1988-1995
 GMC C/K 1500
1969-1978
 GMC C/K 25
1979-1986, 1988-1995
 GMC C/K 2500
1973-1978
 GMC C/K 35
1979-1986, 1988-1995
 GMC C/K 3500
1965-1973
 Oldsmobile Cutlass
1973
 Oldsmobile Omega
1959-1960, 1967-1970
 Pontiac Bonneville
1959-1960, 1970
 Pontiac Catalina
1970
 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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