ACT SB13-HDG4 Heavy Duty Race Sprung Clutch Kit - 4-Pad

The ACT SB13-HDG4 is a Heavy Duty Race Sprung 4-Pad Clutch Kit engineered for high-horsepower street and race applications. This kit pairs ACT's most popular Heavy Duty pressure plate with a spring-centered 4-pad ceramic race disc, delivering aggressive engagement, faster shifting, and reliable performance under demanding conditions.

Pressure Plate Features:

• Exclusive diaphragm design increases clamp load, reduces deflection, and maximizes clutch life
• All diaphragms undergo a four-stage heat-treating process for superior durability
• Precision cover stampings provide rigidity and consistency
• 100% clamp load tested for quality assurance

4-Pad Spring-Centered Race Disc Features:

• Spring-center design properly dampens torsional vibrations for quieter operation
• Engineered to resist failure even under harsh operating conditions
• Select ceramic friction materials deliver high heat tolerance and maximum performance
• Well-suited for smaller disc sizes in smaller displacement engines
• Harsher engagement than street discs, but with faster shift action

ACT Quality Standards:

• Carefully engineered, precisely assembled, and accurately balanced
• Dynamically computer balanced to within .25 oz-in for smooth high-RPM reliability
• Wraparound spring windows and thicker retainer stampings reduce stress concentrations and increase strength
• Light to moderate pedal effort with aggressive engagement characteristics
• Moderate friction life, extended by ACT's exclusive diaphragm design

The ACT SB13-HDG4 clutch kit is recommended for high-horsepower street or race use where reliable power transfer, durability, and fast shifting are essential.