This listing is for a brand new high performance cylinder head parts kit that comes with stainless steel intake and exhaust valves, Z28 style performance valve springs, heat treated spring retainers and heat treated valve locks that are made by Elgin Industries. Kit includes: (8) 1.94" Stainless steel intake valves. (8) 1.5" Stainless steel exhaust valves. (16) Stock diameter Z28 style valve springs. (16) Heat treated 7° valve spring retainers. (32) Heat treated 7° valve locks. Valve Material: Forged one piece 21-4N stainless with hardened stellite tip. Swirl polished head with undercut stem. Chrome plated fully machined stem with undercut -1 Groove. Part # (8)HPV-34+(8)HPV-35+(1)EHC555R+(16)RV943X+(16)55-6100.Elgin Industries