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, Race Master, Intake, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Length, For Chevrolet SB, Each

MANLEY Valve, Race Master, Intake, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Length, For Chevrolet SB, Each

$47.58

SBC/SBF 8mm Stainless Steel 2.020 X 5.000 O.A.L. Race Intake Valve, Ea.

SBC/SBF 8mm Stainless Steel 2.020 X 5.000 O.A.L. Race Intake Valve, Ea.

$39.96

Trick Flow Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.160 in. Length, High Port , For Ford, Set 8

Trick Flow Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.160 in. Length, High Port , For Ford, Set 8

$452.40

MANLEY Valve, Severe Duty, Intake, 2.02 in. Head Dia, 0.311 in. Stem Dia, 5.01 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Intake, 2.02 in. Head Dia, 0.311 in. Stem Dia, 5.01 in. Length, SBC, Set of 8

$607.34