Spec Clutch SM704 Stage 4 Performance Clutch Kit

The Spec Clutch SM704 Stage 4 Clutch Kit is a purpose-built racing clutch designed for heavily modified, high-output engines that demand maximum torque capacity and instantaneous engagement. As a solid hub version of the Stage 3, it delivers the aggressive holding power and reduced rotational mass needed for competitive motorsports applications.

At the core of the Stage 4 is a solid 8-rivet, heat-treated hub and disc assembly that provides exceptional strength and durability under extreme loads. Paired with a high-clamp pressure plate and carbon-graphite friction material, this kit is engineered for superior power transfer without slippage. The rigid hub design enables faster, more direct engagement — a critical advantage on the track.

Puck Configuration Options:

• 3-Puck: Lightest configuration, ideal for maximum weight reduction
• 4-Puck: Balanced compromise between weight savings and engagement smoothness
• 6-Puck: Smoothest engagement of the three; marginally street-drivable but not recommended for daily use

Key Features:

• High-clamp performance pressure plate
• Carbon-graphite semi-metallic friction material
• Solid 8-rivet, heat-treated rigid hub and disc assembly
• Available in 3, 4, or 6-puck configurations
• Release bearing and installation tool kit included
• Designed, hand-built, and tested in the U.S.A.

Intended Use: Drag Racing, Road Racing, Drifting, Rallye, Pulling, Circle Track. Note: The rigid hub design makes this clutch not suitable for street driving. The 6-puck configuration offers the most forgiving engagement of the available options but is still not recommended for regular street use.