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Reference Information

Valve, Intake, XH-428 Stainless, 1.500 in. Head Diameter, 5.036 in. Length, Chevy, Small Block, Each

Manley Severe Duty series performance valves are a great choice for your high performance or race engine. All valves are made from stainless steel (intakes are NK-844; exhausts are XH-428) with chrome stems and hardened valve tips. Severe Duty series valves are made of superior materials, are fully machined and swirl polished, and are available with either undercut "Pro Flo" stems or straight stems.