ARP CA625+ Cylinder Head Studs (VR38DETT-Engines)

Description

The ARP VR38 Head Studs kit is an ARP Pro Series cylinder head stud kit, part number 202-4305, for the Nissan 3.8L VR38DETT DOHC V6. It replaces the factory head bolts for a stronger, more consistent clamp on the head gasket.

Key features of the ARP VR38 Head Studs

• Pro Series cylinder head stud kit
• Material: Custom Age 625+
• Centerless ground after heat-treat
• Threads rolled after heat-treat
• Finish: natural
• Hardened parallel-ground washers included
• ARP stamped on each stud
• SKU: 202-4305

Specifications

Why fit head studs

Getting the best head-to-block seal matters most in engines with high compression, turbochargers, superchargers or nitrous. The ARP VR38 Head Studs kit uses studs rather than bolts, so the block threads are not twisted each time the head is torqued, and the clamping load is more even across the gasket.

How they are made

Each stud in the ARP VR38 Head Studs kit is made from Custom Age 625+ then centerless ground so it is as close to perfectly concentric as possible. The threads are rolled after heat-treat, which ARP rates at about twenty times the fatigue strength of studs threaded before heat-treat. Where ARP undercuts the shorter studs, it evens out stretch and helps compensate for head gasket compression.

Fitting

Install the ARP VR38 Head Studs studs finger tight into the block, fit the head and gasket, then torque the nuts in steps and in the correct sequence using ARP Ultra-Torque lubricant on the threads and washers. Follow the instructions supplied with the kit for the torque figure. Head studs normally need the head off, so they are best fitted during a rebuild or head gasket job.

If you are asking us about this item, quote the SKU 202-4305 so we can match the exact part.

Related ARP products

See also: ARP Cylinder Head Studs (RB26DETT-Engines), ARP U-Cut Cylinder Head Studs (VQ30/VQ35DE-Engines), ARP Cylinder Head Studs (K20A-Engines).

Check the Fitments tab and your engine code before ordering, or contact us with your engine details.