ARP 234-4707 Head Stud Kit High Performance Series Undercut - 8740 12-Point

The ARP 234-4707 is a premium High Performance Series head stud kit featuring 8740 chrome moly steel construction with undercut studs and 12-point heads. Designed for serious performance applications, this kit delivers superior clamping force and reliability for engines that demand more than standard fasteners can provide.

Key Features:

• Premium 8740 chrome moly steel alloy rated at 200,000 psi tensile strength
• Undercut studs equalize stretch for more consistent clamping force
• 12-point heads with wide area flanges eliminate need for valve train removal during retorquing
• Vertical heat-treatment process ensures complete penetration and uniform strength
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 10x better fatigue strength
• Includes hardened parallel-ground washers for even load distribution

Why Choose Studs Over Bolts:

Head studs provide superior clamping accuracy compared to bolts because they stretch only along the vertical axis during torquing, without the twisting forces that affect bolts. The undercut design on shorter studs equalizes stretch rates across all fasteners, compensating for head gasket compression and helping prevent blown gaskets. Studs also simplify engine assembly by allowing cylinder heads and gaskets to align properly without fighting fastener alignment issues.

Installation Notes:

Install studs finger-tight in a relaxed state—never crank them in using a jammed nut. Apply torque only to the nuts using ARP's recommended specifications. Always re-torque after initial engine run-in to compensate for head gasket compression. The 12-point design and wide flanges allow for retorquing without removing valve train components.

ARP's exacting manufacturing process includes vertical rack heat-treatment, multiple centerless grinding passes, and post-heat-treat thread rolling—procedures that set ARP fasteners apart from competitors. Each stud is stamped with the ARP name as your assurance of quality and zero-defect standards.