Authentic ARC racing 22lb valve spring set. These are great for use in Predator heads. Can be used with stock valves and retainers. Best suited for CL-1, CL-2, CL-3, Cl-4, Mod2 and CM265 grind cams when using stock 1:1 rockers. If using ratio rockers these springs may need to be shimmed or may not be strong enough depending on application. If you are using stainless valves you will need to use our heavy duty retainers. These are original ARC racing products, not cheap chinese copies.