Both my dad and my truck came with stainless studs and those crappy powdered metal nuts. He had a couple that sheared off and needed replaced. I got rid of my stock logs at around 20k miles or so for headers and had one broke stud. These are on an 03' and a 04' 6.8l. The V10 manifolds are longer, heavier and all stainless. The longer manifold probably expands and contracts more than a 5.4l manifold.