SPEC SC663 Stage 3 Carbon 6-Puck Clutch Kit LS2/LS3/LS7 Camaro Corvette GTO G8

Vehicle Fitment

• 2010-2015 Chevrolet Camaro SS, 6.2L LS3 V8 - for use with SPEC flat single-mass flywheel (SC57S or SC57A) or compatible aftermarket LS1/6-style flat flywheel only
• 2005-2013 Chevrolet Corvette C6 (Base, Z51, Grand Sport, Z06), 6.0L LS2 / 6.2L LS3 / 7.0L LS7 - for use with SPEC flat single-mass flywheel only; excludes ZR1
• 2005-2006 Pontiac GTO, 6.0L LS2 V8 - for use with SPEC flat single-mass flywheel
• 2008-2010 Pontiac G8 GXP, 6.2L L76/L98 V8 - for use with SPEC flat single-mass flywheel

Fitment Notes

• SC663 is the SPEC flat flywheel style - requires a SPEC flat single-mass billet flywheel (SC57S for steel or SC57A for aluminum) or a compatible aftermarket LS1/6-style flat single-mass flywheel; this kit is NOT compatible with the factory OEM recessed flywheel
• For use with the OEM factory recessed flywheel or OE-style billet flywheel, order SC663-2 instead - that variant is designed as a direct replacement for the stock clutch assembly on the recessed flywheel platform
• The SC663 increases the effective friction surface diameter to 12 in. and reduces rotating mass by up to 36% compared to the OEM flywheel setup - the SPEC flat flywheel is required to achieve these benefits
• This application does not use a conventional mechanical throw-out bearing - the Camaro SS, Corvette C6, GTO, and G8 GXP use a concentric hydraulic slave/bearing assembly; the concentric slave is available as an optional add-on at time of purchase
• Flywheel must be either new or professionally resurfaced before installing the SC663; installation on a glazed or heat-damaged flywheel surface will hinder clutch performance and void warranty
• Break-in period of a minimum 450 miles of primarily city and stop-and-go driving is required before full-throttle engagement, drag launching, or speed-shifting; failure to observe the break-in will void warranty
• Corvette C5 ZR1 (2009-2013) and all automatic transmission-equipped vehicles are excluded from this fitment
• Also available in 3-puck configuration; Stage 3+ full-face variant available as SC663F

Features

• Carbon semi-metallic 6-puck sprung hub disc - the leading puck clutch platform for LS2/LS3/LS7 Gen IV applications in terms of drivability, service life, and torque capacity; 6-puck configuration delivers more progressive engagement and better street manners than fewer-puck alternatives while maintaining aggressive clamping for competition use
• 809 ft-lbs torque capacity - capable of handling supercharged, turbocharged, and heavily modified LS engine builds well above factory power levels for all supported platforms
• Increases effective friction surface diameter to 12 in. when used with the SPEC flat flywheel - larger contact area increases clamping force distribution and heat dissipation compared to the OEM recessed flywheel clutch system
• Reduces rotating mass by up to 36% compared to the OEM flywheel assembly - a significant reduction in rotational inertia that improves throttle response, rev matching, and gear change feel at the track
• Double-sprung hub with spring cover reliefs absorbs drivetrain shock during engagement - protects the transmission input shaft and gearbox from the impulsive loads associated with aggressive clutch engagement; the sprung hub maintains streetability compared to the solid-hub Stage 4
• Heat-treated hub components provide long-term durability under the sustained thermal loads generated by repeated hard launches, track sessions, and aggressive street driving
• High-clamp pressure plate ensures no disc slippage under the elevated torque outputs produced by modified LS-platform engines
• Designed for street, drag racing, road racing, autocross, rally, pulling, and drifting - optimized for the full spectrum of Gen IV LS-powered performance and competition use
• SFI approved - all SPEC clutch kits and flywheels carry SFI certification
• Rebuildable - replacement disc and pressure plate components available individually from SPEC

Specifications

• Part Number: SC663
• UPC: 841802110562
• Stage: Stage 3
• Disc Type: Carbon Semi-Metallic 6-Puck
• Hub Type: Sprung (Double-Sprung with Spring Cover Reliefs)
• Pressure Plate: High-Clamp
• Torque Capacity: 809 ft-lbs
• Friction Surface Diameter: 12 in. (when used with SPEC flat flywheel)
• Rotating Mass Reduction: Up to 36% vs. OEM flywheel assembly
• Flywheel Style Required: Flat single-mass (SPEC SC57S or SC57A, or compatible aftermarket)
• Flywheel Included: No
• Release Bearing: Concentric hydraulic slave/bearing assembly (not a conventional mechanical throw-out bearing); concentric slave available as optional add-on
• Application: 2010-2015 Camaro SS / 2005-2013 Corvette C6 (excl. ZR1) / 2005-2006 Pontiac GTO / 2008-2010 Pontiac G8 GXP - LS2, LS3, LS7, L76, L98 V8
• Break-In Required: Yes - minimum 450 miles city/stop-and-go driving
• SFI Approved: Yes
• Rebuildable: Yes

Included Components

• 1x Carbon Semi-Metallic 6-Puck Clutch Disc (Sprung Hub)
• 1x High-Clamp Pressure Plate
• 1x Installation Tool
• 1x Bearing and Hardware Kit

Product Description

The SPEC SC663 is a Stage 3 performance clutch kit designed for the 2010-2015 Chevrolet Camaro SS, 2005-2013 Chevrolet Corvette C6 (LS2, LS3, and LS7, excluding ZR1), 2005-2006 Pontiac GTO, and 2008-2010 Pontiac G8 GXP - all powered by Gen IV LS-family V8 engines. This is the SPEC flat flywheel style kit, meaning it is engineered to work with the SPEC SC57S (steel) or SC57A (aluminum) flat single-mass billet flywheel, or any compatible aftermarket LS1/6-style flat flywheel - not the OEM recessed factory flywheel. When paired with the appropriate SPEC flywheel, the SC663 increases the effective friction surface diameter to 12 in. and reduces rotating mass by up to 36% compared to the OEM assembly, delivering improvements in throttle response, rev-matching feel, and gear change precision that are meaningful both on the street and at the track.

The carbon semi-metallic 6-puck sprung hub disc provides 809 ft-lbs of torque capacity - substantially more than the factory clutch on any of the supported platforms and sufficient for heavily modified supercharged or turbocharged LS builds. The 6-puck configuration delivers a more progressive engagement feel than smaller-puck units, and the double-sprung hub absorbs torsional shock during engagement to protect the transmission input shaft and gearbox internals from the impulsive load spikes associated with aggressive clutch operation. The high-clamp pressure plate ensures zero slippage under the sustained high-torque, high-RPM demands of drag launching, road course driving, and autocross. The hub's heat-treated components maintain their structural integrity under the sustained thermal loads generated by competition use.

An important installation note specific to these platforms: the Camaro SS, Corvette C6, GTO, and G8 GXP use a concentric hydraulic slave/bearing assembly in place of a conventional mechanical throw-out bearing - an optional concentric slave is available for purchase alongside the SC663. Owners using the factory OEM recessed flywheel or a recessed OE-style billet flywheel should instead order SC663-2, which is specifically designed to fit the stock recessed clutch geometry. As with all SPEC clutch products, the flywheel must be resurfaced if reused, and a mandatory 450-mile city break-in period must be completed before any full-throttle engagement. The SC663 is SFI approved, rebuildable with individual replacement components from SPEC, and backed by SPEC's 120-day limited warranty.