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.

More From This Category

MANLEY Valve, Race Flo, Intake, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Length, SBC, Set of 8

MANLEY Valve, Race Flo, Intake, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Length, SBC, Set of 8

$380.66

MANLEY Valve, Titanium, Intake, Bead Loc, 2.325 in. Head Dia, 0.3415 in. Stem Dia, 5.5 in. Length, Set of 8

MANLEY Valve, Titanium, Intake, Bead Loc, 2.325 in. Head Dia, 0.3415 in. Stem Dia, 5.5 in. Length, Set of 8

$2,550.76

MILODON Valves, Intake, Race, Stainless Steel, 2.25 in. Dia, +.100 Long, Big For Chevrolet, 396, 427, 454, 502, Set of 8

MILODON Valves, Intake, Race, Stainless Steel, 2.25 in. Dia, +.100 Long, Big For Chevrolet, 396, 427, 454, 502, Set of 8

$507.55

MANLEY Valve, Titanium, Intake, Bead Loc, 2.1 in. Head Dia, 0.311 in. Stem Dia, 5.14 in. Height, Set of 8

MANLEY Valve, Titanium, Intake, Bead Loc, 2.1 in. Head Dia, 0.311 in. Stem Dia, 5.14 in. Height, Set of 8

$3,171.69

MANLEY Valve, Race Master, Intake, 2.02 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, For Ford, Each

MANLEY Valve, Race Master, Intake, 2.02 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, For Ford, Each

$47.58

MANLEY Valve, Titanium, Intake, 2.35 in. Head Dia, 0.3415 in. Stem Dia, 5.5 in. Length, Set of 8

MANLEY Valve, Titanium, Intake, 2.35 in. Head Dia, 0.3415 in. Stem Dia, 5.5 in. Length, Set of 8

$2,550.76