ARP 155-3602 High Performance Cylinder Head Bolt Kit Chrome Moly - 8740

The ARP 155-3602 High Performance Series cylinder head bolt kit delivers professional-grade fastening reliability for demanding engine builds. Engineered with premium 8740 chrome moly steel, these head bolts are heat-treated to 180,000 psi—15% stronger than Grade 8 fasteners—providing the clamping force and durability required for high-performance applications.

Key Features:

• 8740 chrome moly steel construction heat-treated to 180,000 psi tensile strength
• Hex head design with wide area flange for even load distribution
• Reduced wrenching profile allows cylinder head retorquing without valve train removal
• Cold-forged manufacturing ensures molecular integrity and consistent quality
• Thread rolled after heat-treat for superior fatigue resistance
• Includes hardened parallel-ground washers for accurate torque readings
• Centerless ground for precise concentricity and easy installation

ARP's exacting manufacturing process sets these fasteners apart from conventional head bolts. Each bolt is vertically heat-treated for complete penetration, then centerless ground through multiple precision cuts to achieve exceptional straightness. This meticulous attention to detail ensures cylinder heads and gaskets align perfectly during assembly, eliminating the fitment issues common with lesser quality fasteners.

The reduced hex head design is a practical advantage for engine builders who need to perform routine maintenance and retorquing procedures. The wide flange distributes clamping loads evenly while accommodating larger diameter valve springs, making these bolts ideal for both street performance and competition applications where frequent servicing is required.

Each kit includes all necessary hardened washers to ensure proper torque application and load distribution. ARP's rigorous quality control means every fastener meets their zero-defect standard, giving you confidence in the integrity of your engine assembly.