ARP ATP5.250-6LUB L19 Head Stud for Nissan VQ35

The ARP ATP5.250-6LUB is a single replacement L19 cylinder head stud designed specifically for Nissan VQ35 engines. This individual stud serves as a replacement component for ARP's complete head stud kit (reference ARP2000 202-4701), allowing builders to replace damaged or lost studs without purchasing an entire kit.

L19 Material Advantages:

• Premium vacuum-melted alloy steel with superior strength and fatigue properties
• Tensile strength rated at 260,000 psi—significantly stronger than standard 8740 chrome moly or ARP2000 materials
• Ideal for high-performance and racing applications where extreme cylinder pressures exceed standard stud capabilities
• Recommended for applications running over 30 PSI of boost
• Air-cooled heat treatment process ensures complete hardness without oil quenching

Special Handling Requirements:

• L19 material requires careful handling—always use gloves during installation to prevent contamination
• Must be kept well-oiled and protected from moisture to prevent stress corrosion
• Not recommended for casual street applications unless extreme loads are anticipated

Installation Notes:

• Thread rolling performed after heat treatment provides superior fatigue strength
• Centerless ground for exceptional straightness and precise cylinder head alignment
• Install studs finger-tight in a relaxed mode—never crank in tightly
• Use proper ARP assembly lubricant and follow specified torque values

ARP studs are the preferred choice of professional engine builders across all forms of motorsports, from drag racing to road racing. This replacement stud maintains the same exacting quality standards as complete ARP kits.