ARP 235-4306 Head Stud Kit 8740 Chrome Moly 12-Point 200,000 PSI

The ARP 235-4306 Pro Series head stud kit delivers professional-grade clamping force and reliability for high-performance and competition engines. Engineered with premium 8740 chrome moly steel and heat-treated to 200,000 PSI, these studs provide superior strength that exceeds aircraft-quality standards.

Key Features:

• Premium 8740 chrome moly steel construction rated at 200,000 PSI
• 12-point head design for precise torque application
• 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 short studs equalize stretch for consistent clamping force
• Includes hardened parallel-ground washers for even load distribution
• Wide-area flanged head eliminates need for valve train removal during retorquing

Why Choose Studs Over Bolts:

Head studs provide superior alignment and more accurate torque loading compared to bolts. Unlike bolts that experience twisting forces during installation, studs stretch only on the vertical axis when the nut is torqued, resulting in more consistent and reliable clamping force. Studs install finger-tight in a relaxed mode, then deliver precise vertical stretch when torqued.

Manufacturing Excellence:

Each ARP stud undergoes rigorous quality control. The precision centerless grinding process involves approximately ten careful cuts, ensuring gaskets and cylinder heads align perfectly during assembly. Thread rolling occurs after heat-treatment—a more expensive process that significantly improves fatigue resistance compared to pre-heat-treat threading used by other manufacturers.

The undercut design on shorter studs compensates for head gasket compression, equalizing stretch between studs of different lengths. This creates more uniform clamping force and helps prevent head gasket failures in demanding applications.

Every stud is marked with the ARP stamp as your assurance of zero-defect quality. Kit includes all necessary fasteners and hardened washers for complete installation.