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, 2.4 in. Head Dia, 0.3415 in. Stem Dia, 6.4 in. Length, Set of 8

MANLEY Valve, Titanium, Intake, 2.4 in. Head Dia, 0.3415 in. Stem Dia, 6.4 in. Length, Set of 8

$3,264.97

Sonnax Boost Valve Kit, AOD, Each

Sonnax Boost Valve Kit, AOD, Each

$77.44

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.95 in. Head Dia, 0.3415 in. Stem Dia, 6.032 in. Length, Set of 8

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.95 in. Head Dia, 0.3415 in. Stem Dia, 6.032 in. Length, Set of 8

$2,550.76

MANLEY Valve, Race Master, Intake, 38mm Head Dia, 0.275 in. Stem Dia, 5.339 Length, For Ford, Each

MANLEY Valve, Race Master, Intake, 38mm Head Dia, 0.275 in. Stem Dia, 5.339 Length, For Ford, Each

$51.07

Sonnax Oversized C3 Clutch Control Valve Kit, Aisin Aw, Tf-80Sc, Tf-81Sc O/S, Each

Sonnax Oversized C3 Clutch Control Valve Kit, Aisin Aw, Tf-80Sc, Tf-81Sc O/S, Each

$71.48

Trick Flow Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 4.750 in. Length, Small For Chevrolet, Each

Trick Flow Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 4.750 in. Length, Small For Chevrolet, Each

$59.45