ARP 234-4337 High Performance Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 234-4337 is a high-performance head stud kit engineered for serious engine builders who demand the ultimate in clamping force and reliability. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi, these studs deliver exceptional strength and fatigue resistance far exceeding standard fasteners.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• 12-point head design for positive engagement and reduced risk of rounding
• Centerless ground after heat-treat for precise concentricity and perfect alignment
• Thread rolled after heat-treat for 10x better fatigue strength than pre-threaded studs
• Vertical rack heat-treating ensures complete and consistent heat penetration
• Includes hardened parallel-ground washers for even load distribution
• Undercut short studs (where applicable) equalize stretch for consistent clamping force

Why Studs Over Bolts?

Head studs provide superior clamping accuracy because they stretch only along the vertical axis when torqued, unlike bolts which experience both torsional and tensile stress simultaneously. This results in more consistent torque loading and better head gasket sealing. Studs also simplify engine assembly by allowing cylinder heads and gaskets to glide into perfect alignment.

Installation Notes:

Install studs finger-tight in a relaxed state—never use a jammed nut to crank them in. Apply torque only to the nut, allowing the stud to stretch purely on the vertical axis. Always re-torque after initial engine run-in to compensate for head gasket compression.

Trusted by professional engine builders across all forms of motorsports, ARP Pro Series head studs represent the gold standard in cylinder head fastening technology. Each stud is stamped with the ARP logo as your assurance of zero-defect quality.