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

Sonnax Oversized Solenoid Pressure Regulator Valve Kit, ZF6Hp21/28/34 (Gen. 2), Each

Sonnax Oversized Solenoid Pressure Regulator Valve Kit, ZF6Hp21/28/34 (Gen. 2), Each

$50.71

Sonnax Tcc Regulator Valve Kit, Ford, 6F35 Gen I, Ii, Each

Sonnax Tcc Regulator Valve Kit, Ford, 6F35 Gen I, Ii, Each

$94.08

MANLEY Valve, Race Master, Exhaust, 29 mm Head Dia, 5.5 mm Stem Dia, 114.25 mm Length, For Honda, Each

MANLEY Valve, Race Master, Exhaust, 29 mm Head Dia, 5.5 mm Stem Dia, 114.25 mm Length, For Honda, Each

$49.91

MANLEY Valve, Extreme Duty, Exhaust, 1.59 in. Head Dia, 0.3136 in. Stem Dia, 4.923 in. Length, For Chevrolet L92, Set of 8

MANLEY Valve, Extreme Duty, Exhaust, 1.59 in. Head Dia, 0.3136 in. Stem Dia, 4.923 in. Length, For Chevrolet L92, Set of 8

$1,037.08

Sonnax Oversized Uv Reduction Valve Kit, 01J, 01T, Each

Sonnax Oversized Uv Reduction Valve Kit, 01J, 01T, Each

$183.28

MANLEY Valve, Street Master, Intake, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Set of 8

MANLEY Valve, Street Master, Intake, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Set of 8

$280.36