ACT Heavy-Duty Clutch Kits are high quality products guaranteeing superior functionality and efficiency. These products provide a clamp load increase up to 50 percent, increasing torque capacity.

Key Features:

• 11"
• Spline Size (Inches): 1-1/8
• Disc Type: Street Disc
• Spline Count: 10
• Product Weight (lbs.): 30.5
• Torque Capacity (ft./lbs.): 735
• Light to moderate pedal effort, smooth positive engagement, OE to mild gear rattle
• Longer friction life, extended by ACT's exclusive diaphragm design
• Carefully engineered, precisely assembled, accurately balanced, with premium organic friction materials for heat tolerance and reduced fade
• Recommended for street and race use
• 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

GM4-HDSS kit features ACT's most popular Heavy Duty pressure plate and most popular street disc. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All 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 Performance Street discs feature premium organic materials with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs have reduced marcel for faster shift action to complement ACT pressure plates, with increased strength and reliability.
Since 1994, Advanced Clutch Technology has specialized in performance clutches and flywheels. All products are made from the highest quality materials and then necessarily tested to ensure they perform to the customers' expectations.

Vehicle Fitment Table

FAQ

Will this fit my vehicle?
Please verify your year, make, model, position, and any fitment notes using the compatibility table above before purchase.

What part number is this?
The listed part number is GM4-HDSS.

Is this product designed for direct replacement?
Yes. This product is intended to match the compatible vehicle applications listed in the fitment table.

Should I confirm fitment before ordering?
Yes. Always compare your original part, position, and vehicle details with the fitment table before ordering.

Common Searches

• HD/Perf Street Sprung for Buick Skylark
• GM4-HDSS fitment
• ACT HD/Perf Street Sprung
• 1967–1971 Buick Skylark HD/Perf Street Sprung
• ACT GM4-HDSS replacement