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, Pro Flo, Exhaust, 1.725 in. Head Dia, 0.3715 in. Stem Dia, 5.374 in. Length, BBC, Each

MANLEY Valve, Pro Flo, Exhaust, 1.725 in. Head Dia, 0.3715 in. Stem Dia, 5.374 in. Length, BBC, Each

$76.67

MANLEY Valve, Street Flo, Intake, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, SBC, Set of 8

MANLEY Valve, Street Flo, Intake, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Length, SBC, Set of 8

$280.36

MANLEY Valve, Race Flo, Exhaust, 28.0 mm Head Dia, 5.5 mm Stem Dia, 102.70 mm Length, For Honda, Each

MANLEY Valve, Race Flo, Exhaust, 28.0 mm Head Dia, 5.5 mm Stem Dia, 102.70 mm Length, For Honda, Each

$50.05

MANLEY Valve, Severe Duty, Intake, 1.93 in. Head Dia, 0.3133 in. Stem Dia, 5.232 in. Length, For Chevrolet L83, Set of 8

MANLEY Valve, Severe Duty, Intake, 1.93 in. Head Dia, 0.3133 in. Stem Dia, 5.232 in. Length, For Chevrolet L83, Set of 8

$628.35

MANLEY Valve, Race Flo, Intake, 2 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

MANLEY Valve, Race Flo, Intake, 2 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

$47.58