Spec Clutch SF664-2 Stage 4 Clutch Kit - Solid Hub, Carbon-Graphite

The SPEC SF664-2 Stage 4 Clutch Kit is a high-performance, solid-hub clutch designed for drivers who demand maximum torque capacity and durability. Built as the solid-hub evolution of the Stage 3, this kit features a heat-treated, 8-rivet solid hub and disc assembly engineered for extreme strength under high-stress conditions.

The SF664-2 is available in 3, 4, or 6 puck configurations to suit a range of performance needs. The 3-puck disc offers the lightest rotational mass for the quickest response, the 6-puck provides the smoothest engagement and remains street-drivable, and the 4-puck strikes a balance between the two. Note that due to the rigid solid hub design, this clutch is not recommended for daily street driving, regardless of puck count — it is purpose-built for competition use.

Key Features:

• High-clamp pressure plate for maximum torque holding capacity
• Carbon-Graphite friction material for consistent performance under heat and heavy use
• Heat-treated, 8-rivet solid hub and disc assembly for maximum strength and durability
• Available in 3, 4, or 6 puck configurations to match your specific application and driving style
• Includes bearing and installation tool kit for a complete installation package

Ideal Applications:

• Drag Racing
• Road Racing
• Rallye
• Drift
• Pulling

The SPEC Stage 4 clutch line is trusted by competitive drivers who require a clutch system that can handle extreme torque loads while maintaining reliable, repeatable performance at the track.