This listing is for a brand new set of 2.250" diameter stainless steel intake valves and 1.720" stainless steel exhaust valves that are made by Elgin Industries. Set includes 8 intake valves and 8 exhaust valves. These are compatible upgrade replacements for many big block Chevy 396, 402, 427 and 454 V8 cylinder heads. Intakes Valves are: Forged one piece 21-4N stainless with hardened stellite tip, Head Diameter: 2.250" Swirl polished head with undercut stem. Valve Length: 5.220" Tip length: 0.250". Exhaust Valves are:Head Diameter: 1.720" Swirl polished head with undercut stem. Valve Length: 5.375" Tip length: 0.250. Both are: Stem Diameter: 0.3715" (3/8"). Stem Type: Chrome plated fully machined stem with undercut -1 Groove Lock Style: Single Groove.