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, Race Master, Intake, Bead Loc, 46.83mm Head Dia, 0.275 in. Stem Dia, 4.63 Length, For Ford, Each

MANLEY Valve, Race Master, Intake, Bead Loc, 46.83mm Head Dia, 0.275 in. Stem Dia, 4.63 Length, For Ford, Each

$51.07

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Set of 8

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Set of 8

$2,550.76

MANLEY Valve, Race Master, Exhaust, 31.0 mm Head Dia, 5.5 mm Stem Dia, 106.90 mm Length, For Honda, Set of 8

MANLEY Valve, Race Master, Exhaust, 31.0 mm Head Dia, 5.5 mm Stem Dia, 106.90 mm Length, For Honda, Set of 8

$399.33

MANLEY Valve, Race Master, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.344 in. Length, BBC, Set of 8

MANLEY Valve, Race Master, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.344 in. Length, BBC, Set of 8

$380.66

MANLEY Big Block Valve Coating, Each

MANLEY Big Block Valve Coating, Each

$89.71

Sonnax Oversized Secondary Pulley Control Valve Kit, Jatco/Nissan JF011E (Re0F10A), Each

Sonnax Oversized Secondary Pulley Control Valve Kit, Jatco/Nissan JF011E (Re0F10A), Each

$60.77