ARP 131-4201 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 131-4201 is a high-performance cylinder head stud kit engineered for serious engine builders who demand the ultimate in clamping force and reliability. Built from premium 8740 chrome moly steel and rated at 200,000 psi tensile strength, this Pro Series kit delivers the consistent performance required for high-stress competition applications.

Superior Manufacturing Process:

• Premium 8740 chrome moly alloy heat-treated to 200,000 psi in vertical racks for complete heat penetration
• Centerless ground after heat-treat for exceptional concentricity and alignment
• Thread rolled after heat-treat for approximately 10 times better fatigue strength than pre-heat-treat threading
• Undercut shorter studs equalize stretch for more consistent clamping force
• 12-point nuts with wide-area flanges allow retorquing without valve train removal

Key Benefits:

• Precision manufacturing ensures cylinder heads and gaskets align perfectly during assembly
• Studs stretch only on vertical axis during torquing, providing more accurate and consistent load than bolts
• Reduced wrenching profile accommodates larger diameter valve springs
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Helps prevent head gasket failure through superior clamping consistency

Each stud is manufactured to ARP's zero-defect quality standard and marked with the ARP stamp as assurance of authenticity. This kit is the preferred choice of professional engine builders across all forms of racing where reliability and performance cannot be compromised. While bolts may be necessary for some street applications with limited engine bay access, studs provide superior assembly ease and torque accuracy for racing and high-performance builds.