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Race valves for your performance engine. The Manley severe duty series performance valves are great choice for your high performance race engine. All valves are made from stainless steel, with chrome stems and hardened valve tips. Severe duty series valves are made of superior material, and are swirl polished and fully machined. Available with undercut "Pro Flo" stems or straight stems. Prices based on a set of 8. Pro Flo Series.