Manley Severe Duty Pro Flo 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 offer improved flow with undercut "Pro Flo" stems.

More From This Category

MANLEY Valve, Titanium, Intake, 2.5 in. Head Dia, 0.3415 in. Stem Dia, 6.4 in. Length, Each

MANLEY Valve, Titanium, Intake, 2.5 in. Head Dia, 0.3415 in. Stem Dia, 6.4 in. Length, Each

$323.90

MANLEY Valve, Extreme/Severe Duty, Exhaust, 1.625 in. Head Dia, 0.311 in. Stem Dia, 5.75 in. Length, Gen II, Set of 8

MANLEY Valve, Extreme/Severe Duty, Exhaust, 1.625 in. Head Dia, 0.311 in. Stem Dia, 5.75 in. Length, Gen II, Set of 8

$683.76

MILODON Valves, Exhaust, Race, Stainless Steel, 1.88 in. Dia, +.350 Long, Big For Chevrolet, 396, 427, 454, 502, Set of 8

MILODON Valves, Exhaust, Race, Stainless Steel, 1.88 in. Dia, +.350 Long, Big For Chevrolet, 396, 427, 454, 502, Set of 8

$500.41

MANLEY Valve, Custom, Titanium, Stem, Each

MANLEY Valve, Custom, Titanium, Stem, Each

$290.76

MANLEY Valve, Race Series, Exhaust, 1.516 in. Head Dia, 0.313 in. Stem Dia, 4.5 in. Length, Gen II, Each

MANLEY Valve, Race Series, Exhaust, 1.516 in. Head Dia, 0.313 in. Stem Dia, 4.5 in. Length, Gen II, Each

$70.15