ARP 206-4203 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 206-4203 is a high-performance cylinder head stud kit featuring premium 8740 chrome moly steel construction rated at 200,000 psi tensile strength. These Pro Series head studs are engineered for serious performance applications where reliability and precision clamping force are critical.

Superior Manufacturing Process:

• Premium 8740 chrome moly alloy steel exceeds aircraft quality standards
• Vertical rack heat-treatment ensures complete and consistent heat penetration to 200,000 psi
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 10x better fatigue strength than pre-heat-treat threading
• Undercut design on shorter studs equalizes stretch for consistent clamping force

Key Features:

• 12-point head design for positive engagement and accurate torque application
• Includes hardened parallel-ground washers for even load distribution
• Precise tolerances allow cylinder heads and gaskets to align effortlessly during assembly
• Rated at 200,000 psi tensile strength for extreme durability
• Each stud is ARP-stamped for authenticity and quality assurance

Why Choose Studs Over Bolts:

Head studs provide superior clamping accuracy compared to bolts because they stretch only along the vertical axis when torqued, eliminating the torsional stress that occurs when bolts are twisted during installation. This results in more consistent and reliable clamping force, easier engine assembly, and better head gasket sealing. Studs should be installed finger-tight in a relaxed state, then torqued via the nut for optimal performance.

Professional engine builders across all forms of motorsports rely on ARP Pro Series head studs for competition powerplants where failure is not an option. Each kit is application-specific and meets ARP's zero-defect, zero-failure quality standard.