The ARP 250-4203 Head Stud Kit is designed to keep your 6.4L Power Stroke sealed under pressure, delivering the clamping force needed to help prevent head lift and gasket failure in stock and performance applications. Built for 2008–2010 6.4L Power Stroke diesel engines, these ARP2000 studs provide increased strength and consistent clamping over factory hardware for reliable performance under load and increased boost.