Nissan Main Stud Kit - L20 4-Cylinder

The ARP Nissan Main Stud Kit for L20 4-Cylinder engines (model 202-5402) replaces factory fasteners with premium chromoly studs engineered for high-reliability applications. This is the correct main stud upgrade for Nissan's L-series four-cylinder platform, delivering the clamping consistency and fatigue resistance required for engines running elevated boost, nitrous, or sustained performance loads.

The kit features ARP's proprietary chromoly material with a black oxide finish, which provides superior corrosion resistance compared to standard bolts while maintaining visual consistency under the valve cover. The 12-point nuts included in this kit offer more contact points than six-point designs, improving grip and reducing fastener slip during engine assembly. Designed for 2-bolt main configurations common to L20 blocks, these studs are manufactured to exacting tolerances and come with the ARP guarantee of proper tensioning for repeatable, leak-free results across multiple rebuild cycles.

This upgrade is essential for builders working on street, competition, or high-output L20 conversions where factory main bolts cannot reliably handle sustained cylinder pressure or vibration. The stud design allows for precise torque application and eliminates bolt stretch, which is critical when assembling engines destined for turbo applications or aggressive tuning. Included hardware makes this a complete solution—no additional fasteners needed for proper main bearing installation.

ARP is the industry standard for critical fastening in performance engine builds, and this kit carries full compatibility verification for the Nissan L20 platform, ensuring correct fit and load-bearing performance on every installation.