ARP 235-4709 Pro Series Cylinder Head Stud Kit Chrome Moly - 8740

The ARP 235-4709 Pro Series head stud kit represents the gold standard in engine fastening technology, trusted by professional engine builders in all forms of racing. These premium fasteners are engineered from 8740 chrome moly steel and heat-treated to an impressive 200,000 psi tensile strength, far exceeding aircraft-grade specifications.

Advanced Manufacturing Process:

• Cold-forged construction ensures molecular integrity and superior strength
• Vertical rack heat-treatment provides complete and uniform heat penetration
• Centerless grinding process with multiple precision cuts ensures exceptional straightness and concentricity
• Thread rolling performed after heat-treat delivers 1000% better fatigue strength compared to pre-heat-treat threading
• Undercut shorter studs equalize stretch for consistent clamping force across the cylinder head

Key Features:

• 12-point head design for positive engagement and precise torque application
• Hardened, parallel-ground washers included for even load distribution
• Precision tolerances allow cylinder heads and gaskets to glide into perfect alignment
• Rated at 200,000 psi tensile strength for extreme competition applications
• Each stud is individually marked with ARP stamp for quality assurance

Why Studs Over Bolts:

Head studs provide superior clamping accuracy because they stretch only along the vertical axis during torque application, unlike bolts which experience both torsional and tensile stress simultaneously. This results in more consistent and accurate torque loading. Studs should be installed finger-tight in a relaxed state, then torqued via the nut. The undercut design on shorter studs compensates for head gasket compression, helping prevent gasket failure and ensuring optimal engine sealing.

This complete kit includes all necessary studs, 12-point nuts, and hardened washers for professional engine assembly. Meets ARP's zero-defect, zero-failure quality standard.