This listing is for a brand new set of 2.250" diameter stainless steel Intake valves and 1.880" stainless steel Exhaust valves. Set includes 8 intake valves and 8 exhaust valves. They are compatible replacements for many big block Chevy 396, 402, 427 and 454 V8 cylinder heads and also could fit many cast iron and aluminum aftermarket heads depending on the head diameter and length you need for your application. Please measure your old valves to check for the correct diameter and length you need. Both are Forged one piece 21-4N stainless with hardened stellite tip. Chrome plated fully machined stem with undercut -1 Groove. INTAKE Valves are Head Diameter: 2.250" Swirl polished head with undercut stem. Valve Length: 5.220" Tip length: 0.250" Stem Diameter: 0.3715" (3/8") Exhaust Valves are Head Diameter: 1.880" Swirl polished head with undercut stem. Valve Length: 5.375" Tip length: 0.250" Stem Diameter: 0.3715" (3/8")