ARP 206-4205 Cylinder Head Stud Kit Chrome Moly - 8740 12-Point

The ARP 206-4205 is a professional-grade cylinder head stud kit engineered with premium 8740 chrome moly steel for high-performance and racing applications. Rated at 200,000 psi tensile strength, these studs deliver superior clamping force and reliability far exceeding standard head bolts.

Advanced Manufacturing Process:

• Precision heat-treated vertically in racks to ensure complete and uniform heat penetration throughout each stud
• Centerless ground through multiple passes for exceptional concentricity and straightness
• Thread rolled after heat-treat for approximately 1000% better fatigue strength compared to pre-heat-treat threading
• Undercut design on shorter studs equalizes stretch for more consistent clamping force
• 12-point head design for precise torque application

Key Benefits:

• Studs provide more accurate and consistent torque loading compared to bolts
• Eliminates twisting forces during installation—studs stretch only on vertical axis
• Exceptional straightness allows cylinder heads and gaskets to glide into perfect alignment
• Reduces risk of head gasket failure through optimized clamping force distribution
• Simplifies engine assembly and disassembly for racing applications requiring frequent service

Kit Includes: Complete stud set with hardened parallel-ground washers for even load distribution and accurate torque readings.

Installation Note: Studs should be installed finger-tight in a relaxed mode—never cranked down with a jammed nut. Re-torque after initial engine run to compensate for head gasket compression.

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