ARP 135-4206 High Performance Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 135-4206 High Performance Head Stud Kit delivers professional-grade engine fastening with 8740 chrome moly steel construction rated at 200,000 psi tensile strength. These premium head studs are engineered for serious performance applications where reliability and consistent clamping force are critical.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy steel construction rated at 200,000 psi
• Vertical rack heat-treating ensures complete and uniform heat penetration throughout each stud
• Centerless ground after heat-treat for exceptional straightness and concentricity
• Thread rolled after heat-treatment for 10x better fatigue strength versus pre-heat-treat threading
• 12-point head design for precise torque application
• Undercut short studs equalize stretch for more consistent clamping force

Performance Advantages:

• Superior clamping force helps prevent head gasket failure
• Precise tolerances ensure cylinder heads and gaskets align perfectly during assembly
• Studs eliminate twisting forces present when using bolts, providing more accurate torque readings
• Studs stretch only on vertical axis when torqued, ensuring consistent load distribution
• Includes hardened parallel-ground washers for even load distribution

Each ARP stud is stamped with the ARP logo as assurance of quality and is manufactured to exacting tolerances that professional engine builders depend on. The undercut design on shorter studs compensates for head gasket compression, providing optimum engine sealing and helping prevent blown head gaskets in high-performance applications.

Note: Studs should be installed finger-tight in a relaxed mode. After initial torquing and engine run-in, re-torque all fasteners to compensate for head gasket compression.