The ARP 230-4202 Custom Age 625+ Head Stud Kit is designed to keep your Duramax sealed under pressure, delivering the clamping force needed to prevent head lift and gasket failure in both stock and high-performance applications. Built for 2001–2016 GM 6.6L Duramax engines (LB7–LML) and constructed from ARP’s Custom Age 625+ material, these studs offer significantly higher strength than standard fasteners, making them ideal for towing, heavy use, and increased boost, while precision manufacturing ensures consistent torque and long-term reliability under demanding conditions.