ARP 155-3604 High Performance Cylinder Head Bolt Kit Chrome Moly - 8740

The ARP 155-3604 High Performance Series cylinder head bolt kit delivers exceptional strength and reliability for demanding engine applications. Manufactured from premium 8740 chrome moly steel and heat-treated to 180,000 psi tensile strength—15% stronger than Grade 8 fasteners—these head bolts provide superior clamping force and consistent torque loading for optimal head gasket sealing.

Key Features:

• Premium 8740 chrome moly steel construction rated at 180,000 psi
• Hex head design with wide area flange for easy installation and retorquing
• Allows cylinder head retorquing without valve train removal
• Cold-forged for molecular integrity and maximum fatigue resistance
• Heat-treated prior to precision thread rolling for superior strength
• Includes hardened parallel-ground washers for even load distribution
• Centerless ground for exceptional straightness and alignment
• Thread rolled after heat-treat for 10x better fatigue strength

Why Choose ARP Head Bolts:

ARP's rigorous manufacturing process sets the industry standard. Each fastener is vertically rack heat-treated for complete penetration, then centerless ground through multiple precision cuts to ensure near-perfect concentricity. This allows cylinder heads and gaskets to align effortlessly during assembly. The post-heat-treat thread rolling process significantly increases fatigue resistance compared to fasteners threaded before heat treatment.

Installation Notes:

Head bolts are ideal for street-driven vehicles where engine bay clearance requires cylinder head removal with the engine in the chassis. The reduced wrenching hex and flanged head design eliminates interference with larger valve springs and permits retorquing without disassembly. Always retorque fasteners after initial engine operation to compensate for head gasket compression.

Each ARP fastener is stamped with the ARP logo as your assurance of quality and is backed by ARP's zero-defect, zero-failure quality standard. Trusted by professional engine builders across all forms of motorsports for both high-performance street and competition applications.