Spec Clutch SA174 Stage 4 Performance Clutch Kit - Carbon Semi-Metallic Puck Disc

The Spec Clutch SA174 Stage 4 Clutch Kit is a purpose-built racing clutch engineered for heavily modified, high-output engines where maximum holding power and instantaneous engagement are the priority. As a solid hub evolution of the Stage 3, this kit is designed exclusively for serious motorsport applications including drag racing, road racing, drifting, rallye, circle track, and pulling competition.

The Stage 4 steps up from the Stage 3 by replacing the sprung hub with a rigid two-piece hub and carrier assembly. The solid hub design uses eight rivets and is heat-treated for exceptional strength and durability under race conditions. This construction eliminates torsional flex for immediate, direct power transfer — critical in high-stress race environments where clutch slip is not an option.

Key Features:

• High-clamp performance pressure plate for maximum grip and torque capacity
• Carbon semi-metallic friction disc available in 3-puck, 4-puck, or 6-puck configurations
• Solid rigid hub with 8-rivet construction, heat-treated for strength and durability
• Two-piece rigid hub and carrier assembly for direct, instantaneous engagement
• Includes high-performance release bearing and installation tool kit
• SFI approved construction

Puck Configuration Guide:

• 3-Puck: Lightest option, most aggressive engagement — ideal for all-out drag race builds
• 4-Puck: Balanced compromise between weight and engagement smoothness
• 6-Puck: Smoothest engagement of the three; most manageable for road race and drift applications

Recommended Driving Disciplines: Drag Racing, Road Racing, Drifting, Rallye, Pulling, Circle Track

Important Note: Due to the rigid hub design and instantaneous engagement characteristics, the Stage 4 is not recommended for street use. Drivers should expect a harsh, race-oriented engagement feel with minimal drivability comfort in stop-and-go conditions.