ARP 124-4204 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 124-4204 Pro Series head stud kit delivers professional-grade engine fastening performance using premium 8740 chrome moly alloy steel rated at 200,000 psi. These competition-quality studs are engineered for high-performance and racing applications where reliability and precision are critical.

Advanced Manufacturing Process:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Vertical rack heat-treatment ensures complete and uniform heat penetration
• Centerless ground for exceptional concentricity and straightness
• Thread rolled after heat-treat for 10x better fatigue strength
• 12-point heads with wide area flanges for easy retorquing without valve train removal

Engineering Advantages:

• Undercut shorter studs equalize stretch for more consistent clamping force
• Compensates for head gasket compression to prevent blown gaskets
• Superior alignment compared to bolts—heads and gaskets glide into position
• More accurate torque loading than bolts (studs stretch only on vertical axis)
• Includes hardened parallel-ground washers for even load distribution

Why Studs Over Bolts: Head studs provide superior clamping consistency because they stretch purely along the vertical axis when torqued, unlike bolts which twist simultaneously. Studs should be installed finger-tight in a relaxed state, then torqued at the nut for optimal performance. This results in more accurate and repeatable torque values, making them the preferred choice for racing and high-performance builds.

Each ARP stud is stamped with the ARP logo as assurance of quality. Kit includes studs, 12-point nuts, and hardened washers. Remember to re-torque after initial engine run-in to compensate for gasket compression.