ARP 152-4001 Cylinder Head Stud Kit Chrome Moly Steel - 8740

The ARP 152-4001 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 studs deliver superior strength and durability compared to standard head bolts.

Key Features:

• Premium 8740 chrome moly alloy 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
• Hex head design with hardened parallel-ground washers included
• Undercut shorter studs equalize stretch for consistent clamping force
• Precision manufacturing ensures perfect alignment of gaskets and cylinder heads

Why Studs Over Bolts?

Head studs provide superior clamping accuracy because they stretch only along the vertical axis during torquing, unlike bolts which experience both torsional and tensile loads simultaneously. This results in more consistent torque loading and better head gasket sealing. Studs also simplify engine assembly by ensuring proper cylinder head and gasket alignment every time.

Installation Note:

Install studs finger-tight in a relaxed mode—never crank them in with a jammed nut. Apply torque only to the nuts, allowing the studs to stretch uniformly. Re-torque after initial engine run-in to compensate for head gasket compression.

Each ARP stud is marked with the ARP stamp as your assurance of zero-defect quality. Trusted by professional engine builders across all forms of racing, ARP head studs represent the pinnacle of fastener technology for high-performance and competition engines.