ARP 154-3602 Cylinder Head Fasteners High Performance Chrome Moly Hex Head Bolts - 8740

ARP 154-3602 cylinder head fasteners deliver professional-grade clamping force and reliability for high-performance engine builds. These hex head bolts are manufactured from premium 8740 chrome moly steel and rated at 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 eliminates need for valve train removal during retorquing
• Precision heat-treated using vertical rack process for complete, uniform heat penetration
• Thread rolled after heat-treatment for superior fatigue strength and durability
• Centerless ground to exacting tolerances for perfect alignment and easy assembly
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings

Manufacturing Excellence:

Each ARP fastener undergoes precision manufacturing processes that set the standard in the industry. The studs are vertically rack heat-treated to ensure consistent 200,000 psi material properties, then centerless ground through multiple passes to achieve exceptional concentricity. Thread rolling is performed after heat-treatment—a costly but critical step that provides approximately ten times better fatigue resistance compared to pre-heat-treat threading methods used by competitors.

Application Benefits:

The reduced wrenching hex head with wide-area flange design allows for cylinder head retorquing without removing valve train components, making maintenance faster and easier. The precision manufacturing ensures that gaskets and cylinder heads align perfectly during assembly. Select applications feature undercut short bolts that equalize stretch characteristics, providing more consistent clamping force and compensating for head gasket compression to help prevent gasket failures.

ARP fasteners are the choice of professional engine builders across all racing disciplines. Each component is stamped with the ARP logo as your assurance of zero-defect, zero-failure quality standards.