ARP 235-4104 Head Stud Kit - High Performance 8740 Chrome Moly Steel

The ARP 235-4104 head stud kit delivers professional-grade cylinder head clamping force using premium 8740 chrome moly steel construction. Rated at 200,000 psi tensile strength, these studs provide superior reliability for high-performance and competition engines where head gasket integrity is critical.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Precision heat-treated vertically in racks for complete, uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue strength than pre-treated threading
• Hex head design for reliable installation and torque application
• Undercut shorter studs equalize stretch for consistent clamping force
• Includes hardened, parallel-ground washers for even load distribution

Why Studs Over Bolts:

Head studs provide superior clamping accuracy compared to bolts because they stretch only on the vertical axis during torque application. Bolts experience both rotational and tensile forces simultaneously, making consistent torque readings more difficult to achieve. Studs also simplify engine assembly by allowing cylinder heads and gaskets to align properly without fighting fastener positioning.

Installation Notes:

Install studs finger-tight in a relaxed mode—never torque them in using a jammed nut. Apply torque only to the nuts, allowing the studs to stretch uniformly. Re-torque after initial engine run to compensate for head gasket compression.

Each stud is marked with the ARP stamp as assurance of quality and zero-defect manufacturing standards. Trusted by professional engine builders across all forms of motorsports competition.