ARP 112-3601 Cylinder Head Fasteners High Performance Chrome Moly - 8740

The ARP 112-3601 cylinder head fastener kit delivers professional-grade strength and reliability for high-performance engine builds. Engineered with premium 8740 chrome moly steel, these fasteners are heat-treated to 180,000 psi—approximately 15% stronger than Grade 8 hardware—ensuring exceptional clamping force and durability under extreme conditions.

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
• Cold-forged construction ensures molecular integrity and superior fatigue resistance
• Thread rolled after heat treatment for dramatically improved fatigue strength
• Centerless ground to exacting tolerances for precise alignment and easy assembly
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Select applications feature undercut short bolts to equalize stretch and prevent head gasket failure

ARP's proprietary manufacturing process sets these fasteners apart from the competition. Each component is vertically heat-treated in special racks to ensure complete penetration, then centerless ground through multiple precision cuts for exceptional straightness and concentricity. This attention to detail allows cylinder heads and gaskets to glide into perfect alignment during assembly.

Designed for both street performance and competition applications, these High Performance Series fasteners meet ARP's demanding quality standards and are trusted by professional engine builders worldwide. The reduced wrenching profile and flanged head design provide convenient access for retorquing without disassembly, making them ideal for engines that require frequent servicing.