Head Stud Kit 12pt CA625 Nissan VR38

The ARP Head Stud Kit 12pt CA625 for Nissan VR38 is a high-performance fastener solution designed for serious engine builders and tuners working with high-boost applications. This premium stud kit is engineered to maintain consistent clamping force across extreme temperature swings and high cylinder pressures, making it ideal for turbocharged V6 engines pushing 600+ horsepower.

Unlike conventional head bolts, head studs eliminate stretch and micro-movement at the cylinder head interface, which helps prevent catastrophic failure under boost. The 12-point design of the studs distributes load more evenly across each fastener shoulder compared to 6-point variants, reducing stress concentration and extending service life on the VR38's aluminum head. The CA625 specification refers to a chrome-moly alloy steel known for its superior tensile strength and fatigue resistance in forced-induction environments.

This kit is particularly beneficial for those upgrading their engines or rebuilding for track use, including applications like twin-turbo conversions or upgraded turbo setups on vehicles such as the R35 GT-R. Installation is straightforward, requiring standard engine work where the studs thread into the block's cylinder head holes and accept washers and nuts on top, allowing precise torque specifications.