ARP 142-4001 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 142-4001 is a high-performance cylinder head stud kit featuring premium 8740 chrome moly steel construction rated at 200,000 psi. These Pro Series head studs are engineered for professional engine builders and competition applications demanding maximum clamping force and reliability.

Premium Manufacturing Process:

• 8740 chrome moly alloy rated superior to aircraft quality materials
• Vertical rack heat treatment ensures complete penetration to 200,000 psi tensile strength
• Centerless ground construction for exceptional concentricity and straightness
• Thread rolled after heat treatment for 10x better fatigue strength
• Hex head design for secure installation

Performance Benefits:

• Provides more accurate and consistent torque loading than bolts
• Eliminates twisting forces during installation for true vertical stretch
• Specially undercut shorter studs equalize stretch for consistent clamping force
• Precise tolerances allow gaskets and cylinder heads to align perfectly
• Helps prevent head gasket failures through optimized compression compensation

Kit Includes:

• Complete stud set with hardened parallel-ground washers
• Hex nuts for installation
• Premium lubricant for accurate torque readings

ARP studs offer significant advantages over bolts for racing and high-performance applications. Unlike bolts that experience both torsional and tensile forces during installation, studs stretch only on the vertical axis when torquing the nut, resulting in more even clamping pressure. The undercut design on shorter studs provides stretch rates similar to longer studs, ensuring uniform head gasket compression across all fasteners.

Each stud is stamped with the ARP logo as assurance of quality. Re-torque after initial engine break-in as head gaskets compress during the first heat cycle.