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, Titanium, All Pro 1.625 in. Stem Dia, .3110 in. Stem Dia, Each

MANLEY Valve, Titanium, All Pro 1.625 in. Stem Dia, .3110 in. Stem Dia, Each

$307.70

MANLEY Valve, Race Master, Exhaust, 33.5 mm Head Dia, 7 mm Stem Dia, 99 mm Length, For Toyota 1FZ-FE, Each

MANLEY Valve, Race Master, Exhaust, 33.5 mm Head Dia, 7 mm Stem Dia, 99 mm Length, For Toyota 1FZ-FE, Each

$68.72

Sonnax Tcc Regulator & Isolator Valve Kit, 4L60-E, 4L65-E, 4L70-E, Each

Sonnax Tcc Regulator & Isolator Valve Kit, 4L60-E, 4L65-E, 4L70-E, Each

$68.29

MANLEY Valve, Titanium, Intake, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Height, Each

MANLEY Valve, Titanium, Intake, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.34 in. Height, Each

$302.72

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.221 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.221 in. Length, SBC, Set of 8

$607.34

MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia, 0.3085 in. Stem Dia, 5.474 in. Length, For Chrysler HEMI, Set of 8

MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia, 0.3085 in. Stem Dia, 5.474 in. Length, For Chrysler HEMI, Set of 8

$607.34