ARP 235-4313 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 235-4313 is a high-performance cylinder head stud kit engineered for serious engine builders who demand the ultimate in clamping force and reliability. Built from premium 8740 chrome moly steel and rated at 200,000 psi tensile strength, these studs deliver superior strength and durability compared to conventional 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 uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue resistance
• Undercut short studs equalize stretch and provide more consistent clamping force
• Includes hardened parallel-ground washers for even load distribution
• Wide area flanged head eliminates need for valve train removal during retorquing

Why Studs Over Bolts:

Head studs provide superior clamping accuracy because they stretch only along the vertical axis when torqued, unlike bolts which twist and stretch simultaneously. This results in more accurate and consistent torque readings. Studs also make engine assembly easier by ensuring perfect alignment of cylinder heads and gaskets. The undercut design on shorter studs compensates for head gasket compression, helping prevent blown gaskets and ensuring optimal engine sealing.

Manufacturing Excellence:

Each ARP stud undergoes precision manufacturing that sets it apart from competitors. After heat treatment, studs are centerless ground through approximately ten precise cuts to achieve near-perfect concentricity. This exacting process ensures that gaskets and cylinder heads align perfectly during installation. The thread rolling process occurs after heat-treat, which significantly increases fatigue strength despite being harder on tooling and more expensive to manufacture.

ARP Pro Series head studs are the choice of top professional engine builders across all forms of motorsports. Each stud is stamped with the ARP logo as assurance of quality and adherence to ARP's zero-defect, zero-failure standard. Whether you're building a competition engine or a high-performance street motor, these studs provide the reliability and strength you need.