Heavy Duty Pressure Plate by ACT GM013 pressure plate features an exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All ACT diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT\’s Heavy Duty pressure plates increase clamp load by 20 to 50 percent. The Heavy Duty pressure plates are recommended for use with a street or race disc. Features Product Weight (lbs.): 24.9 Diameter (Inches): 11 Pressure Plate Type: Heavy Duty SFI1.1 Benefits Light to moderate pedal effort Positive engagement Carefully engineered for improved durability 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability Applications 1973-1981 Pontiac Firebird 1965-1973 Oldsmobile Cutlass 1959-1970 Pontiac Bonneville 1967-1981 Chevrolet Camaro 1966-1972 Chevrolet El Camino 1959-1970 Pontiac Catalina 1966-1972 Chevrolet Caprice 1966-1972 Chevrolet Impala 1970-1973 Pontiac GTO 1966-1982 Chevrolet Corvette 1966-1972 Chevrolet Bel Air 1967-1971 Buick Skylark 1966-1972 Chevrolet Chevelle 1973-1973 Oldsmobile Omega 1973-1973 Buick Regal 1969-1970 Chevrolet Nova 1967-1970 Pontiac Grand Prix What\’s In The Box? 1 – ACT Heavy Duty Pressure Plate Warranty ACT 1-Year Limited Warranty