Head Bolt Kit - 12pt GM LS 04 & Later

The ARP Head Bolt Kit - 12pt GM LS 04 & Later (MPN 134-3710) is a premium chromoly fastening solution engineered for LS-series engine builders who demand critical reliability under high-stress conditions. Manufactured by ARP, a recognized leader in high-performance fastener technology, this kit delivers the precision threading and material consistency required for consistent clamp load in demanding engine applications.

Each bolt in this GM LS head bolt kit features 12-point head geometry optimized for wrench engagement and consistent torque application. The chromoly construction and black oxide finish provide superior tensile strength and corrosion resistance compared to standard fasteners, critical for engines experiencing sustained high combustion pressures and thermal cycling. The kit's engineering ensures uniform preload across all cylinder head mounting points, a fundamental requirement for maintaining proper gasket sealing and preventing head lift during peak boost or nitrous application.

This fastener kit serves LS engine platforms from 2004 forward—a period spanning the iconic LS2, LS3, LS7, and Gen IV variants common to performance builds, engine swaps, and restoration projects. Whether the application is naturally aspirated, turbocharged, or supercharged, proper head bolt specification prevents gasket failure and catastrophic coolant loss. The 12-point configuration is standard across LS architecture, making this kit the direct replacement for factory hardware or an upgrade for original equipment assemblies.

ARP bolts are recognized throughout the engine building community as the specification choice for builds where integrity cannot be compromised. Proper torque sequencing with ARP fasteners—following the manufacturer's recommended specs and using a quality torque wrench—ensures even load distribution and eliminates the risk of head warping or gasket creep.