ARP 234-4724 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 234-4724 is a high-performance cylinder head stud kit engineered for serious engine builders who demand the ultimate in clamping force and reliability. Part of ARP's renowned Pro Series, this kit features premium 8740 chrome moly steel construction rated at 200,000 psi tensile strength, delivering superior performance over standard head bolts in high-stress applications.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy rated far superior to aircraft quality materials
• Vertical rack heat-treating to 200,000 psi ensures complete and uniform heat penetration
• Centerless ground construction for exceptional concentricity and straightness
• Thread rolling performed after heat-treat for approximately 1000% better fatigue strength
• 12-point head design for precise torque application

Performance Benefits:

• Undercut shorter studs equalize stretch for consistent clamping force across all fasteners
• Compensates for head gasket compression to prevent blown gaskets
• Studs stretch only on vertical axis during torquing, eliminating torsional stress
• Superior alignment properties allow cylinder heads and gaskets to glide into position
• Hardened parallel-ground washers included for even load distribution and accurate torque readings

Why Studs Over Bolts: Head studs provide more accurate and consistent torque loading compared to bolts. Unlike bolts that experience both torsional and tensile stress during installation, studs installed finger-tight and torqued via the nut stretch only along the vertical axis, resulting in more reliable clamping force. The undercut design on shorter studs provides stretch rates similar to longer studs, ensuring uniform pressure distribution across the entire cylinder head mating surface.

Each ARP stud is stamped for authenticity and manufactured to exacting tolerances that meet ARP's zero-defect, zero-failure quality standard. This kit is trusted by professional engine builders across all forms of motorsports for competition powerplants where failure is not an option.

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