This listing is for a brand new set of (8) 1.6" diameter stainless steel exhaust valves in +0.100" long that are made by Elgin Industries. Set includes 8 valves. They are compatible replacements for many 1955-1993 small block Chevy 302, 307, 327, 350 and 400 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.