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