ARP 144-4005 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 144-4005 Pro Series head stud kit delivers professional-grade fastener performance for high-performance and competition engines. Manufactured from premium 8740 chrome moly steel and rated at 200,000 psi tensile strength, these studs provide superior clamping force and reliability compared to standard head bolts.

Superior Manufacturing Process:

• Premium 8740 chrome moly alloy rated far superior to aircraft quality
• Precision heat-treated to 200,000 psi using vertical rack process for complete heat penetration
• Centerless ground for exceptional straightness and concentricity
• Thread rolled after heat-treat for 10x better fatigue strength
• Hex head design for secure, positive wrenching

Performance Benefits:

• Provides more accurate and consistent torque loading than head bolts
• Ensures proper alignment of cylinder heads and gaskets during assembly
• Specially undercut shorter studs equalize stretch for consistent clamping force
• Helps prevent head gasket failures and ensures optimum engine sealing
• Studs stretch only on vertical axis during torquing, eliminating torsional load

Kit Includes:

• Complete head stud set for specific application
• Hardened parallel-ground washers for even load distribution
• Premium hex nuts for proper torque application

Installation Notes:

Studs should be installed finger-tight in a relaxed mode—never crank them in tightly. Apply torque only to the nuts, allowing studs to stretch uniformly on the vertical axis. Re-torque after initial engine run to compensate for head gasket compression.

Each ARP stud is stamped with the ARP name as assurance of quality. These fasteners meet ARP's zero-defect, zero-failure quality standard and are the preferred choice of professional engine builders in all forms of racing.