Head Bolt Kit - 12pt GM LSA

The ARP Head Bolt Kit – 12pt GM LSA is a professional-grade fastener system engineered for General Motors LS-series engine cylinder head assembly. Built from chromoly steel with black oxide finish, this ARP 234-3726 kit delivers the clamping force and corrosion resistance demanded in high-performance and restomod applications where OEM fasteners fall short of engineering requirements.

The 12-point head design provides superior engagement with standard sockets and wrenches, reducing fastener rounding risk during installation and removal cycles. Chromoly construction offers higher tensile strength than cast iron fasteners, critical for engines running elevated boost pressure or nitrous oxide systems where head lift becomes a concern. Black oxide coating protects against corrosion in shop environments and during extended storage while maintaining excellent friction characteristics for accurate torque-to-clamp load conversion. This is a complete kit, meaning all fasteners required for a full head installation are included—no separate purchase of individual bolts needed.

Mechanics and engine builders working on LS1, LS3, LSA, and related GM small-block variants rely on ARP fasteners when factory hardware cannot meet their performance targets. Whether supporting a stock rebuild, moderate power increase, or serious forced-induction platform, the Head Bolt Kit – 12pt GM LSA ensures the cylinder head remains sealed under load. Proper installation requires a calibrated torque wrench and adherence to GM specifications; ARP documentation should be consulted before assembly.

ARP has maintained market leadership in fastener engineering for decades by supplying OEM engineers and aftermarket builders with hardware that exceeds baseline requirements. For GM LS-series cylinder head work, this kit represents the industry standard upgrade from cast fasteners to purpose-built chromoly bolts.