ARP 235-4718 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 235-4718 Pro Series head stud kit delivers professional-grade cylinder head fastening using premium 8740 chrome moly steel alloy rated at 200,000 psi tensile strength. These competition-proven studs are trusted by top engine builders for high-performance and racing applications where failure is not an option.

Key Features:

• Premium 8740 chrome moly steel construction rated at 200,000 psi
• Vertical rack heat-treatment ensures complete and uniform heat penetration
• Centerless ground for exceptional straightness and concentricity
• Thread rolled after heat-treat for 10x better fatigue strength
• Undercut design on shorter studs equalizes stretch for consistent clamping force
• 12-point head design for precise torque application
• Includes hardened parallel-ground washers for even load distribution

Manufacturing Process:

Each stud undergoes ARP's exacting manufacturing process, including vertical rack heat-treatment at 200,000 psi, centerless grinding with multiple precise cuts for perfect alignment, and post heat-treat thread rolling. This meticulous approach ensures that cylinder heads and gaskets align effortlessly during assembly while providing superior clamping force and reliability.

Why Studs Over Bolts:

Head studs provide superior accuracy and consistency compared to bolts because they stretch only on the vertical axis when torqued, rather than being twisted during installation. The undercut design on shorter studs compensates for head gasket compression, helping prevent blown gaskets and ensuring optimal engine sealing. Studs also simplify engine assembly by ensuring proper alignment of the cylinder head and gasket.

This kit meets ARP's zero-defect quality standard and is designed for competition engines requiring maximum reliability and performance. Re-torque after initial engine run-in to compensate for head gasket compression.