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.

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MANLEY Valve, Race Master, Exhaust, 1.71 in. Head Dia, 0.3415 in. Stem Dia, Stock in. Length, For Ford 351C, Set of 8

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MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia, 0.3415 in. Stem Dia, 5.344 in. Length, BBC, Set of 8

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MANLEY Valve, Severe Duty, Exhaust, 1.76 in. Head Dia, 0.3415 in. Stem Dia, 5.167 in. Length, BBC, Set of 8

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MANLEY Valve, Race Flo, Exhaust, 1.465 in. Head Dia, 0.3415 in. Stem Dia, 5.08 in. Length, For Ford SB, Set of 8

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