ARP 134-4310 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 134-4310 is a high-performance cylinder head stud kit engineered for serious engine builders who demand the ultimate in clamping force and reliability. Part of ARP's renowned Pro Series lineup, this kit utilizes premium 8740 chrome moly steel fasteners that are heat-treated to an impressive 200,000 psi tensile strength—significantly exceeding aerospace-grade materials.

Superior Manufacturing Process:

• Studs are vertically rack heat-treated to ensure complete and uniform heat penetration throughout the material
• Centerless ground after heat-treat for exceptional concentricity and straightness, allowing cylinder heads and gaskets to align perfectly during installation
• Threads are rolled after heat-treating, providing approximately 1000% better fatigue resistance compared to pre-heat-treat threading methods
• Shorter studs feature strategic undercutting to equalize stretch rates and provide more consistent clamping force

Kit Features:

• 12-point head design for precise torque application
• Includes hardened, parallel-ground washers for even load distribution and accurate torque readings
• Designed for competition applications where maximum strength and zero-failure reliability are essential
• Wide-area flanged heads eliminate the need for valve train removal during cylinder head retorquing

Why Studs Over Bolts: Head studs provide superior clamping accuracy because they stretch only along the vertical axis when torqued, unlike bolts which experience both rotational and tensile forces simultaneously. This results in more consistent and reliable clamping pressure, making studs the preferred choice for racing and high-performance applications where the engine can be assembled with the cylinder heads installed from above.

Each ARP stud is manufactured to exacting tolerances and stamped with the ARP name as your assurance of quality. This kit meets ARP's zero-defect, zero-failure quality standard trusted by professional engine builders across all forms of motorsport.