Work with .530 inch guides and 3/8 inch valve stem diameter;Valve stem oil seals keep unwanted oil from entering the combustion chamber;Several different types of valve seals are offered

• Competition Cams 505-16 3/8 Valve Stem Diameter Positive Stop Valve Stem Oil Seal

Competition Cams 505-16 3/8 Valve Stem Diameter Positive Stop Valve Stem Oil SealCOMP Cams