ARP 235-4110 Cylinder Head Stud Kit High Performance Chrome Moly Steel - 8740

Professional-Grade Head Stud Kit for Maximum Performance

The ARP 235-4110 head stud kit represents the gold standard in engine fastening systems, trusted by professional engine builders across all forms of motorsports. Engineered from premium 8740 chrome moly steel and precision heat-treated to 200,000 psi tensile strength, these studs deliver exceptional clamping force and reliability under extreme conditions.

Superior Manufacturing Process

ARP employs an advanced manufacturing process that sets these head studs apart from the competition. Each stud is vertically rack heat-treated to ensure complete and uniform heat penetration throughout the material. Following heat treatment, every stud undergoes centerless grinding through approximately ten precision cuts, resulting in exceptional concentricity and straightness. This meticulous process allows cylinder heads and gaskets to align perfectly during installation.

Unlike inferior fasteners that are threaded before heat treatment, ARP studs are thread-rolled after heat-treat. While this process is more expensive and harder on tooling, it delivers approximately 1000% better fatigue strength—a critical advantage in high-performance applications.

Key Features

• Premium 8740 chrome moly steel construction rated at 200,000 psi tensile strength
• Vertical rack heat-treatment for uniform material properties
• Centerless ground for exceptional straightness and concentricity
• Thread-rolled after heat-treat for superior fatigue resistance
• Hex head design for convenient installation
• Includes hardened parallel-ground washers for even load distribution
• Undercut studs on select applications for more consistent clamping force

Why Studs Over Bolts?

Head studs offer significant advantages over traditional head bolts for performance applications. During installation, studs are installed finger-tight in a relaxed state, then torqued via the nut. This means the fastener stretches only along the vertical axis when torqued, providing more accurate and consistent clamping force. Bolts, by contrast, experience both torsional and tensile loads simultaneously during installation, making precise torque readings more difficult to achieve.

The superior alignment provided by studs makes engine assembly easier and more precise, with cylinder heads and gaskets gliding into perfect position. Undercut shorter studs equalize stretch characteristics across all fasteners, compensating for head gasket compression and helping prevent blown head gaskets.

Installation Notes

Install studs finger-tight in a relaxed mode—never use a jammed nut to crank them in tightly. Always re-torque fasteners after initial engine run-in to compensate for head gasket compression. Each kit includes hardened parallel-ground washers to ensure accurate torque readings and even load distribution.

Every ARP stud is stamped with the ARP logo as your assurance of quality and authenticity. When only the best will do for your high-performance or competition engine build, ARP delivers the reliability and precision you demand.