ARP 206-4202 Head Stud Kit 8740 Chrome Moly 12-Point 200,000 PSI

The ARP 206-4202 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 an impressive 200,000 PSI tensile strength, providing superior clamping force and reliability under extreme cylinder pressures.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy rated superior to aircraft quality materials
• Vertical rack heat-treatment ensures complete and uniform heat penetration to 200,000 PSI
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolling performed after heat-treatment for 10x better fatigue strength
• Precision tolerances ensure perfect alignment of gaskets and cylinder heads during assembly

Performance Features:

• 12-point head design with reduced wrenching profile
• Wide area flanged head eliminates need for valve train removal during retorquing
• Undercut shorter studs equalize stretch for consistent clamping force across all fasteners
• Compensates for head gasket compression to prevent blown gaskets
• Hardened parallel-ground washers included for even load distribution and accurate torque readings

Why Studs Over Bolts: Studs provide superior installation ease and more accurate torque loading compared to head bolts. Unlike bolts that twist during torquing, studs stretch only on the vertical axis when torque is applied to the nut, resulting in more consistent and reliable clamping force. Each stud should be installed finger-tight in a relaxed mode, never cranked in with a jammed nut.

ARP Pro Series head studs are the choice of professional engine builders across all forms of racing. Each stud is stamped with the ARP logo as assurance of quality and meets ARP's zero-defect, zero-failure standard. Kit includes all necessary studs, nuts, and hardened washers for complete installation.

Note: After initial torquing and engine run-in, studs must be re-torqued to compensate for head gasket compression.