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, Extreme/Severe Duty, Exhaust, 1.654 in. Head Dia., 0.3136 in. Stem Dia., 5.6 in. Length, Gen II, Each

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MANLEY Valve, Titanium, Intake, Bead Loc, 2.1 in. Head Dia., 0.3415 in. Stem Dia., 5.14 in. Height, Set of 8

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Trick Flow Valve, Exhaust, Stainless Steel, 1.450 in. Diameter, 7.0mm Stem, 118.11mm Length, For Ford 4.6L/5.4L, Each

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Edelbrock Valve, Intake, Stainless Steel, 2.050 in. Diameter, .341 in. Stem, For Ford, 289, 302, 351W, for Victor Jr, Each

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