ARP 254-3702 Pro Series Cylinder Head Bolt Kit - 12-Point

The ARP 254-3702 Pro Series cylinder head bolt kit delivers professional-grade clamping force and reliability for high-performance and competition engines. These premium fasteners are engineered to exceed the demands of serious engine builders who require absolute precision and zero-failure dependability.

Key Features:

• Cold-forged ARP2000 material rated at 200,000 psi tensile strength
• 12-point head design with wide-area flange for easier installation
• Heat-treated prior to thread rolling for maximum fatigue resistance
• Reduced wrenching hex allows cylinder head service without valve train removal
• Undercut short bolts provide optimized stretch characteristics to prevent head gasket failure
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Centerless ground for exceptional straightness and alignment

Why ARP Pro Series:

ARP's proprietary manufacturing process ensures superior quality at every step. Each bolt is vertically rack heat-treated to ensure complete and uniform heat penetration throughout the material. The thread rolling process is performed after heat-treatment, resulting in approximately ten times better fatigue strength compared to pre-heat-treat threading methods used by other manufacturers. The centerless grinding process involves multiple precision cuts to achieve near-perfect concentricity, allowing cylinder heads and gaskets to align effortlessly during assembly.

Installation Notes:

Pro Series head bolts provide more accurate and consistent torque loading compared to standard fasteners. The undercut design on shorter bolts equalizes stretch characteristics across all fasteners, delivering uniform clamping force that compensates for head gasket compression. Always re-torque fasteners after initial engine run-in to account for gasket settling.

Each ARP Pro Series bolt is stamped with the ARP logo as your assurance of genuine quality and performance. Trusted by professional engine builders across all forms of motorsports, this kit meets ARP's rigorous zero-defect, zero-failure quality standard.