ARP 145-3607 Cylinder Head Fasteners High Performance Chrome Moly Hex Head Bolts - 8740

The ARP 145-3607 cylinder head fastener kit delivers professional-grade clamping force and reliability for high-performance engine builds. These head bolts are manufactured from premium 8740 chrome moly steel and heat-treated to 180,000 psi tensile strength—15% stronger than Grade 8 fasteners.

Key Features:

• Premium 8740 chrome moly steel construction with 180,000 psi tensile strength
• Hex head design with wide-area flange for easy installation and retorquing
• Cold-forged construction ensures molecular integrity and superior fatigue resistance
• Thread rolled after heat treatment for exceptional durability
• Centerless ground for precise concentricity and perfect alignment
• Includes hardened parallel-ground washers for even load distribution
• Reduced wrenching hex allows cylinder head retorquing without valve train removal

Manufacturing Excellence:

ARP employs a rigorous manufacturing process that sets these fasteners apart. Each bolt is vertically heat-treated in specialized racks to ensure complete and uniform heat penetration. Following heat treatment, the bolts undergo centerless grinding through multiple precision cuts, resulting in exceptionally straight parts with exacting tolerances. Thread rolling is performed after heat treatment, which provides approximately ten times better fatigue strength compared to pre-heat-treat threading methods used by other manufacturers.

Installation Benefits:

The precision manufacturing tolerances mean cylinder heads and gaskets align perfectly during assembly, eliminating the fitment issues common with lower-quality fasteners. The wide-area flanged head design distributes clamping loads evenly while allowing access for retorquing without disassembling valve train components. Included hardened washers ensure accurate torque readings and consistent clamping force across all fasteners.

ARP 145-3607 head bolts are the choice of professional engine builders across all forms of motorsports. Each fastener is stamped with the ARP logo as assurance of quality and backed by ARP's zero-defect, zero-failure quality standard. Complete kit includes all necessary fasteners and washers for a secure, reliable installation.