LS1 Head Stud Kit 12pt.

The ARP LS1 Head Stud Kit 12pt is a chromoly cylinder head fastening system engineered for GM LS-series engines requiring superior clamping force and durability. Built from high-strength chromoly steel with black oxide finish, these head studs provide the reliability demanded in both street and competition applications where factory head bolts show limitations under sustained boost, high compression, or extended thermal cycling.

The 12-point nut design enables precise torque application and reduces rounding risk during installation—critical when working with LS cylinder heads where uneven clamping can lead to gasket failure and coolant leakage. Chromoly material delivers tensile strength superior to OEM bolts, resisting stretching and relaxation across repeated thermal cycles. The black oxide coating provides corrosion resistance in engine bay environments. This is a complete kit containing all studs and nuts required for LS-series head installation, eliminating the need to source individual fasteners.

LS engine builders, turbocharged platform developers, and enthusiasts performing head gasket service or upgrading to higher-compression configurations rely on ARP head studs to maintain consistent clamp load and prevent leakage. The 12-point geometry is particularly valued in high-vibration or high-heat scenarios where bolt preload retention matters. This kit suits both naturally aspirated and boosted LS applications, from LS1 and LS6 street engines to track-focused builds.