The Gator Fasteners Head Studs are a must-have upgrade for your 03-07 Ford 6.0L Powerstroke. These heavy duty studs are rated at 220,000 psi tensile strength and provide the clamping force required to keep your 6.0L Powerstrokes cylinder heads from lifting due to higher combustion pressures. Manufactured rolled threads after heat-treating to provide optimum 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.