ARP 234-4123 Cylinder Head Stud Kit High Performance Chrome Moly - 8740

The ARP 234-4123 head stud kit is engineered for high-performance and competition engines requiring superior clamping force and reliability. Built from premium grade 8740 chrome moly steel and rated at 200,000 psi tensile strength, these studs deliver the strength and consistency that professional engine builders demand.

Advanced Manufacturing Process:

• Precision heat-treated to 200,000 psi using vertical rack positioning for complete and uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness, ensuring perfect alignment of gaskets and cylinder heads
• Thread rolled after heat-treat for approximately 1000% better fatigue strength compared to pre-heat-treat threading
• Select studs feature undercut design to equalize stretch and provide more consistent clamping force

Key Features:

• Premium 8740 chrome moly alloy construction rated at 200,000 psi
• Hex head design for reliable fastening
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings
• Undercut shorter studs help prevent head gasket failure by compensating for gasket compression
• Each stud stamped with ARP for quality assurance

Advantages of Studs Over Bolts: Head studs provide more accurate and consistent torque loading because they stretch only on the vertical axis when torqued, unlike bolts which experience both torsional and tensile forces simultaneously. Studs also simplify engine assembly by ensuring proper alignment of cylinder heads and gaskets. Install studs finger-tight in a relaxed state, then torque the nuts to specification. Re-torque after initial engine run-in to compensate for head gasket compression.

ARP head studs are the preferred choice of professional engine builders across all forms of racing and high-performance applications.