ARP 235-4113 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 235-4113 is a high-performance cylinder head stud kit engineered for serious engine builders who demand maximum clamping force and reliability. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi, these head studs deliver superior strength and durability for high-performance and racing applications.

Key Features:

• Premium 8740 chrome moly steel construction rated at 200,000 psi tensile strength
• Vertical rack heat-treatment process ensures complete and uniform heat penetration
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 10x better fatigue strength than pre-threaded fasteners
• Hex head design for secure installation and removal
• Specially undercut shorter studs equalize stretch for consistent clamping force
• Includes hardened parallel-ground washers for even load distribution
• Each stud stamped with ARP for quality assurance

Why Choose Studs Over Bolts:

Head studs provide superior clamping accuracy compared to bolts because they stretch only on the vertical axis during torque application. Bolts experience both torsional and tensile stress simultaneously, making torque readings less consistent. Studs also simplify engine assembly by allowing cylinder heads and gaskets to glide into perfect alignment. The undercut design on shorter studs compensates for head gasket compression, helping prevent blown gaskets and ensuring optimal sealing.

Installation:

Install studs finger-tight in a relaxed mode—never crank them in using a jammed nut. Apply torque to the nuts according to manufacturer specifications. Always re-torque after initial engine break-in as head gaskets will compress during the first heat cycle.

ARP Pro Series head studs are the proven choice of professional engine builders across all forms of motorsports, delivering zero-defect quality and zero-failure performance when properly installed.