ARP 190-3604 High Performance Cylinder Head Bolt Kit Chrome Moly - 8740

The ARP 190-3604 High Performance Series cylinder head bolt kit delivers professional-grade fastening strength for demanding engine applications. Manufactured from premium 8740 chrome moly steel, these bolts are heat-treated to 180,000 psi tensile strength—15% stronger than Grade 8 fasteners—providing exceptional clamping force and reliability under extreme conditions.

Key Features:

• Premium 8740 chrome moly steel construction rated at 180,000 psi
• Hex head design with wide-area flange eliminates valve train removal for retorquing
• Cold-forged manufacturing ensures molecular integrity and superior fatigue resistance
• Heat-treated prior to thread rolling for maximum strength
• Thread rolled after heat treatment for 10x better fatigue life than pre-heat-treat threading
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Precision centerless ground for exceptional straightness and alignment

Engineering Excellence:

ARP's vertical rack heat-treatment process ensures complete and uniform heat penetration throughout each fastener, delivering consistent strength properties. The precision centerless grinding process involves multiple passes to achieve near-perfect concentricity, allowing cylinder heads and gaskets to align effortlessly during assembly. Select applications feature undercut shorter bolts that equalize stretch characteristics, compensating for head gasket compression to help prevent blown gaskets and maintain optimal sealing.

Installation Note:

Always re-torque fasteners after initial engine run-in, as head gaskets will compress during the break-in period. Follow manufacturer torque specifications and use the included hardened washers for accurate and consistent clamping force.

Trusted by professional engine builders across all forms of motorsports, ARP fasteners meet the industry's highest standards for zero-defect, zero-failure performance. Each component is stamped with the ARP logo as your assurance of quality.