ARP 230-4202 Head Stud Kit 2001-2016 GM 6.6L DuramaxARP 230 4202 Head Stud Kit 2001 2016 GM 6. 6L Duramax Custom Age 625+ head stud kit for GM 6. 6L Duramax diesel. Custom Age 625+ alloy head studs Includes 12 point nuts and hardened washers Black oxide finish Use ARP specified torque sequence Fits: GM: Sierra 2500, Sierra 3500, Silverado 2500, Silverado 3500 Make Model Years Engine GM Silverado 2500 2001 to 2016 GM 6. 6L Duramax GM Silverado 3500 2001 to 2016 GM 6. 6L Duramax GM Sierra 2500 2001 to