2001-2016 6.6L DURAMAX HEAD STUD KIT (118034300)Description Engine builders understand the need for high strength holding power and fasteners that are precision engineered to handle the extreme stresses that high performance diesel engines produce. The PPE Head Stud Kit exceeds industry standards required by performance engines. PPE Head Studs are precision center less ground for accuracy. Threads rolled to Mil S 8879 specifications for increased strength while reducing stress at the threads.