ARP 154-3601 High Performance Cylinder Head Bolt Kit 8740 Chrome Moly

The ARP 154-3601 High Performance Series cylinder head bolt kit delivers professional-grade fastener technology for demanding engine builds. Manufactured from premium 8740 chrome moly steel and heat-treated to 180,000 psi tensile strength—15% stronger than Grade 8—these fasteners provide superior clamping force and reliability for high-performance applications.

Key Features:

• 8740 chrome moly steel construction heat-treated to 180,000 psi
• Hex head design with wide area flange for easy installation and retorquing
• Reduced wrenching profile allows cylinder head service without valve train removal
• Cold-forged manufacturing ensures molecular integrity and consistent quality
• Thread rolled after heat treatment for superior fatigue resistance
• Centerless ground for precise concentricity and proper head alignment
• Includes hardened parallel-ground washers for even load distribution
• Select applications feature undercut short bolts to equalize stretch and prevent head gasket failure

Manufacturing Excellence:

ARP's proprietary manufacturing process sets these fasteners apart from competitors. Each bolt is vertically rack heat-treated for complete penetration and uniform strength, then centerless ground through multiple precision cuts to ensure exceptional straightness. This exacting process allows cylinder heads and gaskets to align perfectly during assembly. Thread rolling is performed after heat treatment—a costly but critical step that delivers approximately ten times better fatigue strength compared to pre-heat-treat threading methods used by lesser manufacturers.

Installation Notes:

The wide-flange hex head design eliminates interference with valve train components, enabling cylinder head retorquing without disassembly. Always retorque fasteners after initial engine run-in to compensate for head gasket compression. Each kit includes hardened washers to ensure accurate torque readings and uniform clamping force across the cylinder head surface.

Trusted by professional engine builders across all forms of motorsports, ARP fasteners represent the pinnacle of cylinder head retention technology. Each component is stamped with the ARP logo as your assurance of zero-defect quality standards.