ARP 234-3703 Pro Series Cylinder Head Bolt Kit - 12-Point

The ARP 234-3703 Pro Series cylinder head bolt kit delivers professional-grade engine fastening performance for high-performance and competition applications. These premium fasteners are engineered to provide superior clamping force and reliability in demanding engine builds.

Key Features:

• Cold-forged ARP2000 alloy construction rated at 200,000 psi tensile strength
• 12-point head design with wide-area flange for improved grip and load distribution
• Heat-treated prior to thread rolling for superior fatigue resistance
• Reduced wrenching hex allows cylinder head service without valve train removal
• Undercut short bolts on select applications provide optimized stretch characteristics
• Includes hardened parallel-ground washers for accurate torque readings
• Application-specific design ensures proper fit and performance

Manufacturing Excellence:

Each bolt undergoes precision heat treatment in vertical racks to ensure complete penetration and consistent 200,000 psi rating—15% stronger than Grade 8 fasteners. The thread rolling process occurs after heat treatment, resulting in approximately 1000% better fatigue strength compared to pre-heat-treat threading methods. This meticulous manufacturing approach ensures molecular integrity and meets ARP's zero-defect quality standard.

Performance Benefits:

The wide-area flanged head design eliminates the need for valve train removal during cylinder head retorquing and accommodates larger diameter valve springs. Undercut short bolts help prevent head gasket failures by providing additional stretch to compensate for gasket compression. The parallel-ground washers distribute clamping load evenly across the cylinder head surface, ensuring consistent torque values and optimal sealing.

This Pro Series head bolt kit represents the pinnacle of fastener technology, trusted by professional engine builders across all forms of motorsports for competition powerplants where reliability is non-negotiable.