Spec Clutch SD854 Stage 4 Race Clutch Kit - Carbon Semi-Metallic Puck Disc

The Spec Clutch SD854 Stage 4 Clutch Kit is a race-grade, solid hub performance clutch designed for heavily modified engines demanding maximum torque transfer, instantaneous engagement, and reduced rotating mass. Built as a solid hub evolution of the Stage 3, this kit is purpose-built for competitive motorsports use and is not intended for daily street driving.

The solid 8-rivet hub is heat treated for exceptional strength and durability, while the high-clamp pressure plate delivers aggressive clamping force well beyond stock specifications. The carbon semi-metallic friction disc is available in a 3, 4, or 6-puck configuration to suit different racing disciplines — choose the 3-puck for the lightest possible rotating assembly, the 6-puck for the smoothest engagement characteristics, or the 4-puck as a balanced compromise between the two. While the 6-puck configuration is technically street-drivable, the rigid hub design makes this kit best suited for race-only applications.

Key Features:

• Solid 8-rivet hub — heat treated for strength and durability
• High-clamp performance pressure plate for maximum torque capacity
• Carbon semi-metallic friction material in 3, 4, or 6-puck configurations
• 3-puck: lightest option for maximum weight savings
• 4-puck: balanced compromise of weight and drivability
• 6-puck: smoothest engagement among puck configurations
• Rigid hub design — race-only, not street-friendly
• Includes release bearing and installation tool kit
• Designed, hand-built, and tested in the USA

Intended Use: Drag Racing, Drift, Road Racing, Rallye, Pulling, Circle Track

The Spec Stage 4 is recommended for race-only applications. For street/strip use, Spec Stage 1 through Stage 3+ kits are the recommended choice. A minimum 450-mile break-in period is required before full-throttle launches or speed shifting.