ARP 130-4062 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 130-4062 head stud kit represents the pinnacle of cylinder head fastening technology, trusted by professional engine builders in all forms of racing and high-performance applications. Engineered with ARP's premium 8740 chrome moly steel alloy rated at 200,000 psi, these studs deliver strength and reliability far exceeding aircraft-quality standards.

Advanced Manufacturing Process:

• Precision heat-treated to 200,000 psi using vertical rack positioning for complete, uniform heat penetration
• Centerless ground through multiple passes to ensure exceptional concentricity and straightness
• Thread rolled after heat-treat for approximately 1000% better fatigue strength compared to pre-heat-treat threading
• Specially undercut shorter studs equalize stretch for consistent clamping force across all fasteners

Key Features:

• 8740 chrome moly alloy construction rated at 200,000 psi tensile strength
• Hex head design for reliable wrenching
• Precision manufacturing ensures cylinder heads and gaskets align perfectly during assembly
• Hardened, parallel-ground washers included for even load distribution and accurate torque readings
• Each stud marked with ARP stamp for authenticity and quality assurance

Advantages of Studs Over Bolts:

Head studs provide superior clamping force consistency compared to bolts because they stretch only along the vertical axis when torqued, rather than experiencing both torsional and tensile forces simultaneously. Studs install finger-tight in a relaxed state, then the nut applies pure tensile load. This results in more accurate torque readings and uniform clamping pressure, helping prevent head gasket failures. Studs also simplify engine assembly by ensuring perfect head and gasket alignment during installation.

Installation Notes:

Install studs finger-tight without using a jammed nut to crank them in. Apply torque only to the nut, allowing the stud to stretch evenly. Always re-torque after initial engine run-in to compensate for head gasket compression. The undercut design on shorter studs provides stretch rates similar to longer studs for balanced clamping force across the entire cylinder head.

ARP's exacting manufacturing tolerances and quality control ensure zero-defect, zero-failure performance in the most demanding racing and high-performance street applications.