ARP 144-3604 Cylinder Head Fasteners High Performance Series Hex Head Bolts - 8740

The ARP 144-3604 Cylinder Head Fastener Kit delivers professional-grade clamping force for high-performance and racing engines. These hex head bolts are engineered from premium 8740 chrome moly steel and heat-treated to 200,000 psi, providing strength that exceeds aerospace standards and surpasses Grade 8 fasteners by 15%.

Advanced Manufacturing Process:

• Vertical rack heat-treatment ensures complete and uniform heat penetration throughout each fastener
• Centerless grinding after heat-treat creates exceptionally straight, concentric bolts for precise alignment
• Thread rolling performed after heat-treat delivers approximately 1000% better fatigue strength compared to pre-heat-treat threading
• Cold-forged construction maintains molecular integrity for maximum reliability

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Hex head design with wide-area flange eliminates need for valve train removal during retorquing
• Hardened, parallel-ground washers included for even load distribution and accurate torque readings
• Select applications feature undercut short bolts that equalize stretch and compensate for head gasket compression
• Reduced wrenching hex allows clearance for larger diameter valve springs

Installation Benefits:

The precision manufacturing tolerances ensure cylinder heads and gaskets align effortlessly during assembly. Each fastener provides consistent, accurate torque loading for reliable engine sealing and optimal head gasket longevity. The wide-area flanged head design allows in-vehicle cylinder head service without removing valve train components, making maintenance faster and easier.

Each kit includes all necessary fasteners and hardened washers for complete installation. ARP stamps each fastener as assurance of their zero-defect, zero-failure quality standard trusted by professional engine builders across all forms of motorsports.