ARP 253-3702 Pro Series Cylinder Head Bolt Kit - 12-Point

The ARP 253-3702 Pro Series head bolt kit delivers professional-grade engine fastening performance for high-performance and competition applications. These cold-forged bolts are engineered to provide superior clamping force and reliability under extreme cylinder pressures.

Key Features:

• Pro Series construction with 200,000 psi tensile strength rating
• 12-point head design for precise torque application
• Wide area flanged head eliminates need for valve train removal during retorquing
• Cold-forged manufacturing ensures molecular integrity
• Heat-treated prior to thread rolling for superior fatigue resistance
• Undercut short bolts provide more stretch to compensate for head gasket compression
• Includes hardened parallel-ground washers for even load distribution
• Reduced wrenching hex accommodates larger diameter valve springs

Engineering Excellence:

ARP Pro Series bolts undergo vertical rack heat-treatment to ensure complete and uniform heat penetration throughout each fastener. The thread rolling process occurs after heat-treatment, which provides approximately ten times better fatigue strength compared to fasteners threaded before heat-treat. Each bolt is centerless ground through multiple precision cuts to achieve exceptional concentricity and straightness.

Performance Benefits:

The application-specific design of these Pro Series bolts ensures optimal performance with competition components. The undercut design on shorter bolts equalizes stretch characteristics across all fasteners, creating more consistent clamping force and helping prevent head gasket failures. The wide flange head distributes load evenly while allowing cylinder head service without removing valve train components.

Every ARP Pro Series bolt meets the company's zero-defect, zero-failure quality standard, making these fasteners the choice of leading professional engine builders across all forms of motorsports.