The ARP 230–4201 head studs are a must have a grade for your 01-16 6.6L Duramax. These extra heavy duty studs are rated it 220,000 PSI tensile strength and provide the clamping force required to keep your 6.6 liter Duramax cylinder heads from lifting due to higher combustion pressures.
Manufactured in ARP’s Santa Paula, California plant from proprietary ARP 2000 material with the threads rolled after heat treating to provide optimal fatigue strength. They are centerless ground to assure perfect concentricity. Also included in each kit are heat treated, chrome-moly steel 12 point nuts and parallel ground washers, with a black oxide. Finish for extra durability.