ARP 134-4306 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 134-4306 is a professional-grade cylinder head stud kit engineered for high-performance and competition engines. Manufactured from premium 8740 chrome moly steel and rated at 200,000 psi tensile strength, these studs deliver superior clamping force and reliability far exceeding standard head bolts.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• 12-point head design for precise torque application
• Vertical rack heat-treatment ensures complete and consistent heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue strength versus pre-treated threading
• Undercut studs (where applicable) equalize stretch for consistent clamping force
• Includes hardened parallel-ground washers for even load distribution

Why Choose Studs Over Bolts:

Head studs provide significant advantages for performance applications. Unlike bolts, which twist while being torqued (creating dual stress forces), studs are installed finger-tight and stretch only along the vertical axis when the nut is torqued. This results in more accurate and consistent torque readings, better clamping force, and improved head gasket sealing. Studs also simplify engine assembly by allowing the cylinder head and gasket to glide into perfect alignment.

Installation Note:

Install studs finger-tight in a relaxed mode—never crank them in using a jammed nut. Always re-torque after initial engine run-in to compensate for head gasket compression.

Trusted by professional engine builders across all forms of racing, ARP fasteners meet the company's zero-defect, zero-failure quality standard. Each stud is stamped with the ARP logo as your assurance of authenticity and quality.