ARP 201-4703 Custom Age 625+ Head Stud Kit for BMW S63 Undercut 12-Point

The ARP 201-4703 head stud kit is engineered for BMW S63 turbocharged V8 engines, delivering exceptional clamping force and reliability for high-performance and high-boost applications. Manufactured from ARP's proprietary Custom Age 625+ super-alloy, this kit provides superior strength over factory head bolts, making it ideal for engines pushing beyond factory power limits.

Key Features:

• Custom Age 625+ material with 260,000-280,000 psi tensile strength
• Undercut stud design for equalized stretch and consistent clamping force
• 12-point nuts for precise torque application
• Thread rolled after heat-treat for 20 times better fatigue strength
• Complete resistance to atmospheric corrosion and oxidation
• Includes hardened washers and ARP Ultra-Torque assembly lubricant

ARP's Custom Age 625+ alloy represents the cutting edge in fastener technology, offering superior fatigue cycle life and toughness compared to traditional materials. Each stud is precision heat-treated and centerless ground to ensure molecular integrity and perfect concentricity. The undercut design on select studs equalizes stretch for more consistent clamping force, helping prevent head gasket failure under extreme cylinder pressures. Compatible with BMW S63 engines found in F10/F90 M5, F12/F13/F06 M6, and F85/F86/F95/F96 X5M/X6M models.