ARP 235-4506 High Performance Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 235-4506 Pro Series head stud kit delivers professional-grade engine fastening performance using premium 8740 chrome moly steel construction. Engineered for high-performance and racing applications, these studs are heat-treated to 200,000 psi tensile strength—far exceeding standard bolt specifications and providing the ultimate in clamping force and reliability.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Precision heat-treated vertically in racks for complete, even heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 10x better fatigue strength
• Undercut short studs equalize stretch for consistent clamping force
• Hex head design for reliable torque application
• Includes hardened parallel-ground washers for even load distribution
• Facilitates precise cylinder head and gasket alignment during assembly

Why Choose Studs Over Bolts:

Head studs provide superior accuracy compared to bolts because they stretch only along the vertical axis when torqued, eliminating the twisting forces that bolts experience. This results in more consistent torque loading and better head gasket sealing. The undercut design on shorter studs compensates for head gasket compression, helping prevent blown gaskets and ensuring optimal engine sealing. Studs should be installed finger-tight in a relaxed state, never cranked in with excessive force.

Manufacturing Excellence:

ARP's exacting manufacturing process sets these studs apart from competitors. Each stud is precisely machined through multiple centerless grinding passes after heat-treatment, ensuring exceptional straightness and concentric tolerances. This attention to detail allows cylinder heads and gaskets to glide into perfect alignment—something impossible with inferior quality fasteners. Every stud is stamped with the ARP logo as your assurance of zero-defect quality standards.

Trusted by professional engine builders across all forms of motorsports, ARP Pro Series head studs represent the industry benchmark for competition engine fasteners. Always re-torque studs after initial engine run-in to compensate for head gasket compression.