Spec Clutch SC683H Stage 2 Plus Performance Clutch Kit

The SPEC SC683H Stage 2 Plus Clutch Kit is engineered for modified engines that demand more torque capacity than a standard Stage 2 clutch can deliver. Bridging the gap between the Stage 2 and Stage 3, this kit maintains the familiar street-friendly engagement feel of the Stage 2 while delivering a 15–20% higher torque capacity — making it an ideal upgrade for performance-built engines used in both daily and competitive driving environments.

At the core of this kit is a composite multi-friction disc in a full-faced configuration, featuring carbon semi-metallic material on one side and Kevlar® on the other. This hybrid friction pairing provides excellent wear resistance, smooth engagement, and the holding power needed for high-output applications. The hub is double-sprung with spring cover reliefs for added flexibility, while heat-treated components ensure long-term strength and durability under demanding conditions.

Key Features:

• High-clamp pressure plate for increased clamping force
• Composite multi-friction disc — carbon semi-metallic on one side, Kevlar® on the other
• Double-sprung hub with spring cover reliefs for flexibility
• Heat-treated components for strength and durability
• High-torque sprung hub and disc assembly
• Bearing and installation tool kit included

Intended Use: Street, Drag, Road Race, Rally, Autocross, Pulling, Drift

All SPEC clutch kits are designed, hand-built, and tested in the USA, and every kit is SFI approved. The SC683H is intended for use with the factory flywheel or an aftermarket flywheel modeled after the factory recessed friction surface design.