ARP 134-3602 Cylinder Head Fasteners High Performance Hex Head Bolts - 8740

The ARP 134-3602 cylinder head fastener kit delivers professional-grade clamping force and reliability for high-performance engine builds. Engineered from premium 8740 chrome moly steel, these hex head bolts are rated at 200,000 psi tensile strength—significantly exceeding Grade 8 specifications and providing the strength needed for demanding applications.

Advanced Manufacturing Process:

• Precision heat-treated to 200,000 psi using vertical rack positioning for complete, uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 10x better fatigue strength compared to pre-heat-treat threading
• Cold-forged construction ensures molecular integrity throughout the fastener

Key Features:

• Premium 8740 chrome moly alloy construction rated at 200,000 psi
• Reduced wrenching hex head with wide-area flange eliminates valve train removal for retorquing
• Hardened, parallel-ground washers included for even load distribution and accurate torque readings
• Select applications feature undercut short bolts to equalize stretch and compensate for head gasket compression
• Precision manufacturing ensures cylinder heads and gaskets align perfectly during assembly

Each ARP fastener is manufactured to exacting tolerances and stamped with the ARP mark as assurance of zero-defect quality. The reduced hex head design allows for cylinder head service without removing valve train components, while the wide flange accommodates larger diameter valve springs. These fasteners provide superior clamping consistency compared to traditional bolts, making them the choice of professional engine builders across all forms of motorsports.

Complete kit includes all necessary fasteners and hardened washers for proper installation. For optimal performance, re-torque fasteners after initial engine operation to compensate for head gasket compression.