Spec Clutch SP643 Stage 3 Performance Clutch Kit - Carbon Semi-Metallic 6-Puck

The SPEC SP643 Stage 3 Clutch Kit is engineered for heavily modified street and race engines that demand aggressive torque capacity without sacrificing daily drivability. Designed for street and race cars that require high-performance engagement while maintaining a comfortable, streetable pedal feel, the Stage 3 delivers reliable performance across a wide range of driving styles and conditions.

Key Features:

• Carbon semi-metallic 6-puck sprung hub disc — the industry-leading puck clutch for drivability, service life, and torque capacity
• High-clamp pressure plate for maximum clamping force under high-stress conditions
• Double-sprung hub with spring cover reliefs for flexibility and heat-treated components for strength and long-term durability
• High-torque sprung hub and disc assembly for quick, precise engagement
• Bearing and alignment tool kit included — everything needed for installation
• SFI approved — meets safety standards for performance and race applications
• Available in 4-puck configuration on select applications
• Disc diameter: 9.500 in. (241mm)
• Input shaft diameter: 1.031 in. | Input spline count: 23
• Flywheel not included

Recommended Driving Applications: Street, Drag Racing, Drift, Road Race, Rallye, Pulling, Autocross

Designed, hand-built, and tested in the U.S.A., the SPEC Stage 3 delivers the ideal balance of aggressive engagement and street usability, making it the go-to choice for high-output builds that see both road and track duty.