ARP 145-4006 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 145-4006 cylinder head stud kit delivers professional-grade engine fastening performance using premium 8740 chrome moly steel construction. Rated at 200,000 psi tensile strength, these studs are engineered to provide superior clamping force and reliability in high-performance and racing applications.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy rated far superior to aircraft quality materials
• Precision heat-treated vertically in racks to 200,000 psi for complete and uniform heat penetration
• Centerless ground through multiple passes for exceptional concentricity and straightness
• Thread rolled after heat-treat for up to 10 times better fatigue strength than pre-heat-treat threading
• Specially undercut shorter studs to equalize stretch and provide more consistent clamping force

Key Benefits:

• Hex head design for secure installation and removal
• Superior alignment allows cylinder heads and gaskets to glide into position effortlessly
• Undercut design compensates for head gasket compression to help prevent blown gaskets
• Studs stretch only on vertical axis during torquing for more accurate and consistent load distribution
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Each stud is marked with ARP stamp as assurance of quality

Installation Advantages:

Head studs offer significant advantages over bolts for performance applications. Studs install finger-tight in a relaxed state and are torqued via the nut, allowing the fastener to stretch only vertically without the twisting force experienced by bolts. This results in more precise torque loading and superior clamping consistency. Studs also simplify engine assembly by ensuring proper cylinder head and gasket alignment, making them the preferred choice for racing engines that require frequent servicing.

The ARP 145-4006 kit represents the industry standard trusted by professional engine builders across all forms of motorsports competition. Kit includes all necessary studs, nuts, and hardened washers for complete installation.