Spec Clutch SN663 Stage 3 Clutch Kit with Carbon Semi-Metallic Disc

The SPEC SN663 Stage 3 Clutch Kit is engineered for heavily modified street and race engines that demand superior torque capacity without sacrificing daily drivability. Featuring a comfortable pedal feel and quick, responsive engagement, this kit strikes the ideal balance between aggressive performance and streetable manners.

At the heart of the Stage 3 kit is a carbon semi-metallic 4 or 6-puck sprung hub disc — a design recognized as the leading puck clutch for its combination of drivability, service life, and high torque capacity. The hub is double-sprung with spring cover reliefs for added flexibility, and all components are heat-treated for long-term strength and durability under both low and high stress conditions. The 6-puck configuration is standard on most applications; a 4-puck disc can be specified at time of order for applications requiring it.

Kit Includes:

• High-clamp performance pressure plate
• 4 or 6-puck carbon semi-metallic friction disc with high-torque sprung hub assembly
• Release bearing
• Installation tool kit

Key Features:

• High clamp pressure plate for increased clamping force
• Carbon semi-metallic friction material for excellent wear characteristics
• Double-sprung hub with spring cover reliefs for flexibility and heat-treated components for durability
• Good wear characteristics under both low and high stress usage
• Excellent drivability for a performance puck-style clutch

Intended Use: Street, Drag Racing, Drift, Road Racing, Rallye, Pulling, Autocross