Head studs for the 6.4L Powerstroke (2008–2010) give a stronger, more secure hold than factory head bolts. They keep the cylinder heads tightly clamped to the engine block, even under high boost and pressure. This helps prevent head gasket failure. Made from high-strength materials, head studs work well in performance or heavy-duty builds. Many owners upgrade to head studs to improve sealing and increase engine life.