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. Image is a representation. Actual product may vary

More From This Category

MANLEY Valve, Severe Duty, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.446 in. Length, For Ford, Set of 8

MANLEY Valve, Severe Duty, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.446 in. Length, For Ford, Set of 8

$687.67

Sonnax Oversized Boost Regulator Valve Kit, VW/Audi 01M, 01N, 01P, Each

Sonnax Oversized Boost Regulator Valve Kit, VW/Audi 01M, 01N, 01P, Each

$68.88

MANLEY Valve, Extreme Duty, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.365 in. Length, SBC, Set of 8

MANLEY Valve, Extreme Duty, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.365 in. Length, SBC, Set of 8

$1,037.08

MANLEY Valve, Race Master, Exhaust, 29.0 mm Head Dia, 6 mm Stem Dia, 99.50 mm Length, Set of 8

MANLEY Valve, Race Master, Exhaust, 29.0 mm Head Dia, 6 mm Stem Dia, 99.50 mm Length, Set of 8

$399.33

MANLEY Valve, Race Master, Intake, 44.5mm Head Dia, 0.275 in. Stem Dia, 4.63 Length, For Ford, Each

MANLEY Valve, Race Master, Intake, 44.5mm Head Dia, 0.275 in. Stem Dia, 4.63 Length, For Ford, Each

$51.07

MANLEY Valve, Severe Duty, Exhaust, 1.94 in. Head Dia, 0.311 in. Stem Dia, 6.1 in. Length, Gen II, Each

MANLEY Valve, Severe Duty, Exhaust, 1.94 in. Head Dia, 0.311 in. Stem Dia, 6.1 in. Length, Gen II, Each

$85.44