ARP 134-3603 High Performance Hex Head Bolt Kit 8740 Chrome Moly

The ARP 134-3603 High Performance Series head bolt kit delivers professional-grade fastening strength 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 hex head bolts provide reliable cylinder head clamping force for high-performance and racing engines.

Key Features:

• 8740 chrome moly steel construction heat-treated to 180,000 psi
• Hex head design with wide area flange for enhanced load distribution
• Reduced wrenching profile allows cylinder head retorquing without valve train removal
• Thread rolled after heat-treat for superior fatigue resistance
• Precision-manufactured to exacting tolerances for proper gasket and head alignment
• Includes hardened parallel-ground washers for accurate torque readings
• Cold-forged construction ensures molecular integrity

ARP's High Performance Series bolts are engineered for applications where superior clamping force is essential but ultimate racing-level specifications aren't required. The hex head configuration with integrated flange eliminates the need for separate washers on the head surface while providing convenient access for retorquing procedures. Each bolt is manufactured to ARP's rigorous quality standards, ensuring consistent performance and reliability in demanding engine builds.

These fasteners are ideal for street performance, hot rod, and enthusiast racing applications where engine longevity and consistent head gasket sealing are priorities. The 180,000 psi rating provides substantial margin over stock fasteners while maintaining ease of installation and serviceability.