ARP 204-4707 High Performance Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 204-4707 High Performance Head Stud Kit delivers professional-grade cylinder head clamping force for high-performance and racing applications. Manufactured from premium 8740 chrome moly steel and heat-treated to 200,000 psi, these undercut studs with 12-point nuts provide superior strength and reliability compared to OEM fasteners.

Key Features:

• Premium 8740 chrome moly alloy rated at 200,000 psi tensile strength
• Precision heat-treated vertically in racks for complete, uniform heat penetration
• Centerless ground after heat-treat for exceptional straightness and concentricity
• Thread rolled after heat-treat for 10x better fatigue strength than pre-threaded studs
• Undercut short studs equalize stretch for more consistent clamping force
• 12-point nuts with wide-area flanged design for easy retorquing without valve train removal
• Includes hardened, parallel-ground washers for even load distribution
• Each stud marked with ARP stamp for quality assurance

Why Studs Over Bolts:

Head studs provide more accurate and consistent torque loading than bolts because they stretch only on the vertical axis during installation. Unlike bolts, which twist while being torqued, studs are installed finger-tight and then torqued via the nut, eliminating torsional stress. The undercut design on shorter studs compensates for head gasket compression, helping prevent blown gaskets and ensuring optimal engine sealing. Studs also simplify engine assembly by allowing cylinder heads and gaskets to align properly and glide into position effortlessly.

Installation Notes:

Install studs finger-tight in a relaxed mode—never crank them in using a jammed nut. After initial torquing and engine break-in, always re-torque the nuts to compensate for head gasket compression. The 12-point head design and wide flange permit retorquing without removing valve train components.

Trusted by professional engine builders across all forms of motorsports, ARP Pro Series head studs represent the highest quality fastener solution available for competition powerplants.