Spec Clutch SR074 Stage 4 Carbon-Graphite Clutch Kit 6-Puck

The Spec Clutch SR074 Stage 4 Clutch Kit is a high-performance, race-focused clutch system built for heavily modified engines demanding maximum torque transfer and instantaneous engagement. As the solid-hub evolution of the Stage 3 clutch, the Stage 4 is engineered for motorsport applications where aggressive engagement and reduced rotating mass are critical priorities.

The disc hub features a solid 8-rivet construction with a heat-treated assembly for superior strength and durability under extreme load conditions. The kit is available in 3-puck, 4-puck, and 6-puck configurations — choose the 3-puck for the lightest rotating assembly, the 6-puck for the most manageable engagement characteristics, or the 4-puck as a balanced compromise between the two. Note: due to the rigid hub design, this clutch is not recommended for general street use, though the 6-puck configuration is considered marginally street-drivable.

Key Features:

• High-clamp performance pressure plate for maximum clamping force
• Carbon-graphite friction material for high torque capacity and thermal resistance
• Solid 8-rivet, heat-treated hub and disc assembly
• Available in 3-puck, 4-puck, and 6-puck configurations
• 9.500 in. (241mm) disc diameter
• 14-spline input shaft, 1.000 in. shaft diameter
• Bearing and tool kit included
• Designed, hand-built, and tested in the U.S.A.

Intended Use: Drag Racing, Road Racing, Rally, Drifting, Pulling, Circle Track

The Stage 4 is part of SPEC's race-only clutch lineup (Stages 4–5), purpose-built for competition vehicles requiring extreme holding power and precise, aggressive engagement.