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. (8) 2.02 Stainless steel intake valves. (8) 1.6 Stainless steel exhaust valves. (16) Stock diameter Z28 style valve springs. (16) Heat treated 7° valve spring retainers. (32) Heat treated 7° valve locks. Please measure your old valves to check for the correct diameter and length you need or contact me with any application questions. They work great for stock, towing and most mild performance cams and work best with cams up to 0.490 lift. Spring Part Number: RV943X. Outside Diameter: 1.259. Inside Diameter: 0.785. Closed Pressure: 110 lbs. Open Pressure: 285 lbs. Spring Type: Single with damper. Valve Specifications – Intake. Material: Forged one piece 21-4N stainless with hardened stellite tip. Head Diameter: 2.020 Swirl polished head with undercut stem. Valve Length: 4.910. Tip length: 0.250. Stem Diameter: 0.3415″ (11/32″). Stem Type: Chrome plated fully machined stem with undercut -1 Groove. Lock Style: Single Groove. Valve Specifications – Exhaust. Head Diameter: 1.600 Swirl polished head with undercut stem. Powered by SixBit’s eCommerce Solution.