Spec Clutch SC665-2 Stage 5 Full-Metallic Sintered Iron Clutch Kit

The SPEC SC665-2 Stage 5 Clutch Kit is SPEC's highest-rated single-disc performance clutch, engineered for extreme street, drag racing, pulling, and autocross applications. Built around a full-metallic sintered iron disc, this kit delivers the highest possible friction coefficient available in a single-disc design, providing massive holding power for heavily modified engines pushing serious torque output.

The SC665-2 is designed for use with the OE recessed flywheel or any aftermarket flywheel modeled after the factory design, making it a direct-fit upgrade for compatible GM LSX platforms. With a torque capacity rated up to 1,081 ft-lbs, this kit is built to handle power levels far beyond what any OEM or mild performance clutch can withstand.

Key Features:

• Full-metallic sintered iron disc — maximum friction coefficient for extreme torque transfer
• Disc diameter: 292mm (11.500 in) — full-faced, unsprung hub design
• High-clamp pressure plate — increased clamping force for positive engagement under load
• Solid 12-rivet hub — heavy-duty construction for high-stress applications
• Heat-treated assembly — enhances strength and long-term durability
• Torque capacity: up to 1,081 ft-lbs
• Includes: pressure plate, sintered iron disc, bearing, and tool kit
• Designed for use with OE recessed LS3/LS7-style flywheel

Intended Use: Drag Racing, Pulling, Autocross, Extreme Street

Important: This clutch is street-drivable but not street-friendly due to aggressive, harsh engagement characteristics inherent to full-metallic friction material. A proper break-in period of a minimum of 450 miles of primarily city/stop-and-go driving is required before full-throttle launches or speed shifting. Flywheel resurfacing is strongly recommended prior to installation unless a new SPEC flywheel is being used.