ARP 218-4704 Pro Series Head Stud Kit - Undercut 12-Point ARP2000

The ARP 218-4704 Pro Series Head Stud Kit delivers professional-grade engine fastening performance with ARP2000 material rated at 200,000 psi tensile strength. This complete kit features undercut studs and 12-point nuts designed for high-performance and competition engines where reliability and precise clamping force are critical.

Key Features:

• ARP2000 material with 200,000 psi tensile strength for superior clamping force
• Undercut stud design equalizes stretch between long and short studs for consistent gasket compression
• 12-point nuts allow easy access without valve train removal for retorquing
• Thread rolled after heat treatment for 10x better fatigue strength than pre-rolled threads
• Centerless ground to exacting tolerances ensuring perfect concentricity and alignment
• Vertical rack heat treatment ensures complete and uniform heat penetration
• Includes hardened parallel-ground washers for even load distribution and accurate torque readings

Why Studs Over Bolts:

Head studs provide superior clamping accuracy because they stretch only on the vertical axis when torqued, unlike bolts which experience both torsional and tensile forces simultaneously. This results in more consistent torque loading and better head gasket sealing. The undercut design on shorter studs compensates for gasket compression, helping prevent head gasket failures in high-performance applications.

Installation:

Install studs finger-tight in a relaxed mode—never use excessive force or a jammed nut during installation. Apply torque only to the nuts following manufacturer specifications. Always re-torque after initial engine operation to compensate for head gasket compression.

ARP's precision manufacturing process includes cold forging for molecular integrity, heat treatment prior to thread rolling, and centerless grinding for exceptional straightness. Each component is manufactured to ARP's zero-defect quality standard, making this the preferred choice of professional engine builders across all forms of motorsports.