Spec Clutch SF143F Stage 3 Plus High-Performance Clutch Kit

The SPEC SF143F Stage 3 Plus Clutch Kit is the flagship performance clutch solution for heavily modified street and race engines that demand torque capacity beyond what the standard Stage 3 can deliver. Engineered for high-powered applications requiring strong, reliable engagement without sacrificing daily drivability, the Stage 3 Plus strikes the ideal balance between aggressive performance and street-friendly manageability.

At the heart of this kit is a full-faced carbon semi-metallic friction disc, which delivers superior friction coefficient, exceptional wear life, and smooth drivability in a single package — a key advantage over the puck-style disc used in the standard Stage 3. The high-torque double-sprung hub features spring cover reliefs for added flexibility, while heat-treated components ensure long-term strength and durability under demanding conditions.

Kit Includes:

• High-clamp performance pressure plate
• Full-faced carbon semi-metallic friction disc
• High-torque double-sprung hub and disc assembly
• Release bearing
• Installation tool kit

Intended Applications:

• Street performance
• Drag racing
• Drifting
• Road racing
• Pulling
• Autocross and rally

SPEC clutches are proudly manufactured in the U.S.A. using advanced production methods and strict tolerances, making them a trusted choice for both serious street builds and competition race programs.