ARP 260-4702 Cylinder Head Stud Kit Pro Series - 12-Point

The ARP 260-4702 Pro Series Head Stud Kit represents the pinnacle of cylinder head fastening technology for high-performance and racing applications. Engineered with undercut studs and 12-point nuts, this kit delivers superior clamping force and reliability that professional engine builders depend on for all-out competition powerplants.

Premium ARP2000 Construction:

Each stud is manufactured from premium grade 8740 chrome moly steel alloy, rated far superior to aircraft quality materials. ARP's exacting manufacturing process includes vertical rack heat-treating to 200,000 psi tensile strength, ensuring complete and uniform heat penetration throughout every fastener. Following heat treatment, each stud is centerless ground through approximately ten precision cuts to achieve near-perfect concentricity and exceptional straightness.

Key Features:

• ARP2000 Pro Series construction rated at 200,000 psi tensile strength
• Premium 8740 chrome moly steel alloy for maximum strength and durability
• Undercut studs equalize stretch for consistent clamping force
• 12-point nuts with wide-area flanged design for easy retorquing
• Thread rolled after heat treatment for 10x better fatigue strength
• Centerless ground for precise concentricity and perfect alignment
• Includes hardened parallel-ground washers for even load distribution
• Cold-forged construction ensures molecular integrity

Advanced Engineering Benefits:

The undercut design on shorter studs equalizes stretch characteristics across all fasteners, providing more consistent clamping force that compensates for head gasket compression during installation. This critical feature helps prevent blown head gaskets and ensures optimum engine sealing under extreme conditions. The thread rolling process occurs after heat treatment, which significantly increases fatigue strength compared to pre-heat-treat threading methods used by competitors.

Installation Advantages:

Unlike head bolts that experience torsional stress during installation, studs install finger-tight and stretch only on the vertical axis when torqued. This provides more accurate and consistent torque loading without twisting forces. The 12-point head design with wide-area flange eliminates the need for valve train removal during cylinder head retorquing and accommodates larger diameter valve springs. The precision manufacturing ensures that gaskets and cylinder heads align perfectly and glide smoothly into position during assembly.

Each kit includes all necessary studs, 12-point nuts, and hardened parallel-ground washers for complete installation. ARP's zero-defect quality standard and precision tolerances make this the preferred choice of professional engine builders across all forms of racing and high-performance applications.