ARP 123-3703 High Performance Cylinder Head Bolt Kit Chrome Moly - 8740

The ARP 123-3703 High Performance Series cylinder head bolt kit delivers professional-grade fastening strength for demanding engine applications. Manufactured from premium 8740 chrome moly steel and heat-treated to 180,000 psi—15% stronger than Grade 8—these bolts provide superior clamping force and reliability for high-performance and racing engines.

Key Features:

• Premium 8740 chrome moly steel construction rated at 180,000 psi tensile strength
• 12-point head design with wide-area flange for easier installation and removal
• Cold-forged for molecular integrity and superior fatigue resistance
• Heat-treated prior to thread rolling for maximum strength
• Thread rolled after heat-treatment for 10x better fatigue life compared to pre-heat-treat threading
• Centerless ground for precise concentricity and perfect alignment
• Reduced wrenching profile allows cylinder head retorquing without valve train removal
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings

Engineering Excellence:

ARP's precision manufacturing process sets these fasteners apart from competitors. Each bolt is vertically rack heat-treated to ensure complete and uniform heat penetration throughout the entire fastener. The centerless grinding process involves multiple precise cuts to achieve exceptional straightness and concentricity, allowing cylinder heads and gaskets to align perfectly during installation.

Performance Benefits:

The wide-area flanged head design eliminates the need to remove valve train components when retorquing cylinder heads, saving valuable time during engine maintenance and rebuilds. The 12-point head configuration provides multiple engagement positions for easier access in tight engine compartments. Select applications feature undercut short bolts that provide more uniform stretch characteristics, equalizing clamping force across the head and helping prevent head gasket failures.

Each ARP fastener is stamped with the ARP logo as your assurance of quality and is backed by the company's zero-defect, zero-failure quality standard. Trusted by professional engine builders across all forms of motorsports, ARP fasteners deliver the reliability and performance required for both street performance and all-out competition engines.