ARP 235-4509 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 235-4509 Pro Series Head Stud Kit delivers professional-grade engine fastening performance using premium 8740 chrome moly steel construction. These high-strength studs are engineered for competition and high-performance applications where reliability and precision are critical.

Advanced Manufacturing Process:

• Premium 8740 alloy rated at 200,000 psi tensile strength
• Precision heat-treated vertically in racks for complete penetration and consistency
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue strength than pre-threaded studs
• Undercut studs equalize stretch for consistent clamping force across all fasteners

Performance Benefits:

• Superior clamping force prevents head gasket failure
• Precise alignment ensures gaskets and cylinder heads install smoothly
• Studs stretch only on vertical axis during torquing for accurate, consistent loading
• Reduced wrenching hex design allows cylinder head retorquing without valve train removal
• Includes hardened parallel-ground washers for even load distribution

ARP studs are manufactured to exacting tolerances that exceed aerospace standards, making them the choice of professional engine builders across all forms of racing. Each stud is stamped with the ARP logo as assurance of quality and backed by ARP's zero-defect manufacturing standard.

Note: Studs should be installed finger-tight in a relaxed mode. Always re-torque after initial engine operation to compensate for head gasket compression.