ARP 235-4707 High Performance Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 235-4707 cylinder head stud kit delivers professional-grade fastening strength for high-performance and racing engines. Engineered with premium 8740 chrome moly steel and precision manufacturing, this Pro Series kit provides the reliability that top engine builders demand for competition powerplants.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Undercut studs for equalized stretch and consistent clamping force
• 12-point head design for superior torque application
• Thread rolled after heat treatment for 10x better fatigue strength
• Centerless ground for precise concentricity and perfect alignment
• Vertical rack heat treatment ensures complete penetration
• Hardened parallel-ground washers included for even load distribution
• Wide area flanged head eliminates need for valve train removal during retorquing

Superior Manufacturing Process:

Each stud undergoes ARP's exacting quality standards, including vertical rack heat treatment to 200,000 psi, centerless grinding for exceptional straightness, and post-heat-treat thread rolling. This manufacturing approach produces studs with superior fatigue resistance and dimensional accuracy, allowing cylinder heads and gaskets to glide into position with perfect alignment.

Undercut Design Advantage:

The specially undercut shorter studs equalize stretch between all fasteners, providing more consistent clamping force that compensates for head gasket compression. This design helps prevent blown head gaskets and ensures optimum engine sealing under extreme conditions.

Installation Notes:

Studs should be installed finger-tight in a relaxed mode—never cranked in using a jammed nut. When torquing the nuts, the stud stretches only on the vertical axis, providing more accurate and consistent torque loading compared to bolts. Always re-torque after initial engine run as head gaskets compress during the break-in process.

This kit meets ARP's zero-defect, zero-failure quality standard and is designed for competition applications where maximum reliability is essential.