COMP Cams Magnum 5.2L/5.9L Drop-in Valve Spring Kit is designed to maximize the potential of Magnum Cylinder Heads. Allowing up to .500" of lift, this kit provides spring rates that can handle significantly more aggressive lobe profiles. Designed to drop right onto stock Magnum 5.2L/5.9L cylinder heads, it includes beehive valve springs, retainers, and Metal-body Viton valve Seals while using stock valve locks. By combining quality components in a package that does not require any machining, the kit is developed to make your valve train upgrade as easy as possible!