ARP 235-4018 High Performance Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 235-4018 High Performance Head Stud Kit delivers professional-grade clamping force and reliability for demanding engine applications. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi, these studs provide the strength and consistency required for high-performance and competition engines.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy rated superior to aircraft quality
• Vertical rack heat-treatment to 200,000 psi ensures complete and uniform heat penetration
• Centerless ground to exacting tolerances for perfect concentricity and alignment
• Thread rolled after heat-treat for 10x better fatigue strength compared to pre-heat-treat threading
• Undercut shorter studs equalize stretch for consistent clamping force across all fasteners

Performance Benefits:

• Superior clamping force helps prevent head gasket failure
• Precise tolerances allow cylinder heads and gaskets to align perfectly during assembly
• Hex head design with wide-area flange eliminates need for valve train removal during retorquing
• Studs install in relaxed mode and stretch only on vertical axis when torqued, providing more accurate and consistent loading than bolts
• Easier engine assembly and disassembly, especially important for racing applications requiring frequent servicing

Each kit includes hardened parallel-ground washers to ensure even load distribution and accurate torque readings. The ARP 235-4018 meets ARP's zero defect, zero failure quality standard and is trusted by professional engine builders across all forms of motorsports.

Note: Studs should be installed finger-tight and must be re-torqued after initial engine operation to compensate for head gasket compression.