ARP 235-4109 High Performance Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 235-4109 cylinder head stud kit delivers professional-grade clamping force and reliability for high-performance and racing engines. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi tensile strength, these studs provide superior strength and fatigue resistance compared to standard head bolts.

Key Features:

• Premium 8740 chrome moly steel construction with 200,000 psi tensile strength
• Vertical rack heat-treatment ensures complete and uniform heat penetration
• Centerless ground for exceptional concentricity and perfect alignment
• Thread rolled after heat-treat for 10x better fatigue strength
• Hex head design for easy installation and removal
• Undercut short studs equalize stretch for consistent clamping force
• Includes hardened parallel-ground washers for even load distribution

Why Studs Over Bolts:

Head studs provide more accurate and consistent torque loading than bolts because they stretch only on the vertical axis when torqued, rather than being twisted during installation. This results in more uniform clamping force and better head gasket sealing. Studs also make engine assembly easier by allowing the cylinder head and gasket to glide into perfect alignment.

Installation Note:

Install studs finger-tight in a relaxed mode—never crank them in using a jammed nut. After initial engine run-in, re-torque the nuts to compensate for head gasket compression and ensure optimal sealing.

ARP's precision manufacturing process and exacting quality standards make these head studs the choice of professional engine builders across all forms of motorsports. Each stud is stamped with the ARP logo as your assurance of zero-defect quality.