ARP 235-4310 High Performance Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 235-4310 is a high-performance cylinder head stud kit engineered for demanding applications where reliability and precision are critical. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi tensile strength, these studs deliver superior clamping force and fatigue resistance compared to standard head bolts.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• 12-point head design for secure grip and easy installation
• Vertical rack heat-treatment ensures complete and uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 10x better fatigue strength
• Undercut shorter studs equalize stretch for more consistent clamping force
• Includes hardened parallel-ground washers for even load distribution

Why Choose Studs Over Bolts:

Head studs provide superior accuracy and consistency compared to head bolts. Unlike bolts, which experience torsional and tensile stress simultaneously during installation, studs are installed finger-tight and only stretch along the vertical axis when torqued. This results in more precise torque loading and better head gasket sealing. The precision manufacturing ensures cylinder heads and gaskets align perfectly during assembly, making installation faster and more reliable—especially important for competition engines requiring frequent servicing.

Manufacturing Excellence:

Each ARP stud undergoes rigorous quality control. After precision heat-treatment, studs are centerless ground through approximately ten passes to achieve near-perfect concentricity. Thread rolling is performed after heat-treatment—a more expensive process that produces vastly superior fatigue resistance. The undercut design on shorter studs compensates for head gasket compression, helping prevent gasket failures and ensuring optimal engine sealing.

ARP head studs are the choice of professional engine builders across all forms of motorsports. Each stud is stamped with the ARP logo as assurance of quality and adherence to ARP's zero-defect, zero-failure standard.