Spec Clutch SF663-2 Stage 3 Performance Clutch Kit

The Spec Clutch SF663-2 Stage 3 Clutch Kit delivers the performance and durability demanded by serious street and track drivers. Built around a carbon semi-metallic 6-puck sprung hub disc, this kit offers an aggressive yet streetable engagement combined with high torque capacity — making it one of the most versatile puck-style clutch options available for modified vehicles.

The disc assembly features a double-sprung hub with spring cover relieves for enhanced flex and heat-treated internal components for long-term strength and durability. A high-clamp pressure plate rounds out the assembly, ensuring firm, consistent power transfer under demanding conditions. This kit is also available in a 3-puck configuration for those preferring a different engagement feel.

Key Features:

• Carbon-graphite friction material for superior heat resistance and friction performance
• 6-puck sprung hub disc with double-sprung design for drivability and torque capacity
• High-clamp pressure plate for firm, consistent power transfer
• Heat-treated hub components for strength and long service life
• Spring cover relieves for added flexibility under load
• Bearing and tool kit included for complete installation
• Designed and built in the U.S.A.

Ideal Applications: Street performance, drag racing, autocross, road racing, rally, pulling, and drift.