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, Severe Duty, Exhaust, 1.55 in. Head Dia, 0.3136 in. Stem Dia, 4.923 in. Length, For Chevrolet LS1, Each

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MANLEY Valve, Race Master, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 4.965 in. Length, For Chevrolet SB, Each

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MANLEY Valve, Severe Duty, Intake, Bead Loc, 2.2 in. Head Dia, 0.3085 in. Stem Dia, 5.405 in. Length, For Chrysler HEMI, Each

MANLEY Valve, Severe Duty, Intake, Bead Loc, 2.2 in. Head Dia, 0.3085 in. Stem Dia, 5.405 in. Length, For Chrysler HEMI, Each

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MANLEY Valve, Race Master, Intake, 2.19 in. Head Dia, 0.3415 in. Stem Dia, 5.244 in. Length, For Ford 351C, Set of 8

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