ARP 235-4705 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 235-4705 Pro Series head stud kit delivers professional-grade engine fastening with premium 8740 chrome moly steel construction rated at 200,000 psi. Designed for high-performance and competition applications, these studs provide superior clamping force and reliability compared to standard head bolts.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Vertical rack heat-treating ensures complete and consistent heat penetration throughout each stud
• Centerless ground after heat-treat for exceptional concentricity and straightness
• Thread rolled after heat-treatment for 10x better fatigue strength than pre-heat-treat threading
• Undercut design on shorter studs equalizes stretch for consistent clamping force
• 12-point nuts with wide area flanged heads for retorquing without valve train removal
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings

Why Choose Studs Over Bolts:

Head studs provide more accurate and consistent torque loading because they stretch only on the vertical axis when torqued, unlike bolts which twist and stretch simultaneously. Studs also make engine assembly easier by ensuring proper cylinder head and gasket alignment. The undercut design helps prevent blown head gaskets by compensating for gasket compression during installation.

Installation Notes:

Install studs finger-tight in a relaxed mode—never crank them in with a jammed nut. After initial engine run-in, re-torque the fasteners to compensate for head gasket compression. Each stud is marked with the ARP stamp as your assurance of quality and authenticity.