ARP 114-3602 Cylinder Head Fasteners High Performance 8740 Chrome Moly

The ARP 114-3602 is a high-performance cylinder head bolt kit engineered for demanding applications where reliability and strength are non-negotiable. Manufactured from premium 8740 chrome moly steel, these fasteners are heat-treated to 200,000 psi tensile strength—significantly exceeding aerospace-grade standards and 15% stronger than Grade 8 bolts.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Hex head design with reduced wrenching profile and wide-area flange
• Vertical rack heat-treatment ensures complete and uniform heat penetration
• Thread rolled after heat-treat for superior fatigue strength
• Centerless ground for exceptional concentricity and straightness
• Includes hardened, parallel-ground washers for even load distribution
• Wide-area flanged head eliminates need for valve train removal during retorquing
• Select applications feature undercut short bolts to equalize stretch and prevent head gasket failure

Manufacturing Excellence:

ARP's exacting manufacturing process sets these fasteners apart from competitors. Each bolt is cold-forged to ensure molecular integrity, then placed vertically in precision racks for heat-treatment—not tumbled in baskets like lesser products. After heat-treat, bolts are centerless ground through approximately ten precise cuts to achieve near-perfect concentricity. This attention to detail ensures cylinder heads and gaskets align effortlessly during assembly.

Post-Heat-Treat Thread Rolling:

Unlike competitors who thread fasteners before heat-treatment when material is softer, ARP thread rolls after heat-treat. While this process is significantly more expensive and harder on tooling, it delivers approximately 1000% better fatigue strength—a critical advantage in high-stress applications.

Installation Notes:

The reduced wrenching hex and wide-area flange design allows cylinder head retorquing without removing valve train components, saving valuable time during engine assembly and maintenance. The included hardened washers ensure accurate torque readings and uniform clamping force. Always retorque fasteners after initial engine run-in to compensate for head gasket compression.

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