Spec Clutch SC665 Stage 5 Full-Metallic Clutch Kit - Sintered Iron

The Spec Clutch SC665 Stage 5 Clutch Kit is SPEC's top-tier single-disc performance clutch, engineered for maximum grip in the most demanding race and high-output applications. Built around a full-metallic sintered iron disc delivering the highest possible friction coefficient available in a single-disc design, the SC665 is rated to handle up to 1,081 ft-lbs of torque — making it ideal for heavily modified drag, pulling, and autocross builds.

Key Features:

• Full-metallic sintered iron friction disc — highest friction coefficient in SPEC's single-disc lineup
• High-clamp pressure plate for maximum clamping force and torque retention
• Solid 12-rivet hub for rigid, no-slip power transfer
• Heat-treated hub and disc assembly for long-term strength and durability under extreme loads
• Torque capacity: 1,081 ft-lbs
• Best for: Drag racing, pulling, autocross, and extreme street use
• Includes: High-clamp pressure plate, sintered iron disc, bearing, and tool kit

The Stage 5 sits at the top of SPEC's single-disc performance ladder. While technically street-drivable, engagement is aggressive and not suited to relaxed daily driving — this kit is built for racers who demand every bit of holding power their drivetrain can deliver. A proper break-in period is required before full-throttle launches or speed shifting.

Note: Flywheel compatibility varies by application. Confirm correct flywheel fitment for your specific build before ordering. Manufactured in the USA by SPEC Clutch, Inc.