ARP 190-4202 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 190-4202 head stud kit delivers professional-grade engine fastening performance using premium 8740 chrome moly steel rated at 200,000 psi. Trusted by top engine builders in professional racing, these studs provide superior clamping force and reliability for high-performance and competition engines.

Advanced Manufacturing Process:

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

Performance Benefits:

• Superior alignment during assembly—cylinder heads and gaskets glide into position
• More accurate and consistent torque loading compared to bolts
• Reduced risk of head gasket failure through optimized clamping
• Studs stretch only on vertical axis during torquing for predictable results
• Includes hardened parallel-ground washers for even load distribution

Installation: Studs should be installed finger-tight in a relaxed mode, never cranked in tightly. Apply torque to the nut rather than the stud body. Re-torque after initial engine run to compensate for head gasket compression.

Each stud is stamped with the ARP logo as assurance of quality and is manufactured to exacting tolerances that exceed aerospace standards. Complete kit includes all necessary hardware and washers for professional-quality engine assembly.