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, Street Master, Intake, 2.19 in. Head Dia, 0.3415 in. Stem Dia, 5.244 in. Length, BBC, Each

MANLEY Valve, Street Master, Intake, 2.19 in. Head Dia, 0.3415 in. Stem Dia, 5.244 in. Length, BBC, Each

$37.43

Sonnax Oversized Control Main Relief Valve, Allison, Allison 1000/2000/2400, Each

Sonnax Oversized Control Main Relief Valve, Allison, Allison 1000/2000/2400, Each

$78.91

MANLEY Valve, Titanium, Intake, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Height, Each

MANLEY Valve, Titanium, Intake, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Height, Each

$302.72

MANLEY Valve, Race Master, Exhaust, 1.59 in. Head Dia, 0.3415 in. Stem Dia, 4.8 in. Length, For Ford, Set of 4

MANLEY Valve, Race Master, Exhaust, 1.59 in. Head Dia, 0.3415 in. Stem Dia, 4.8 in. Length, For Ford, Set of 4

$190.33

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.3715 in. Stem Dia, 4.97 in. Length, For Chrysler SB, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.3715 in. Stem Dia, 4.97 in. Length, For Chrysler SB, Set of 8

$380.66

MANLEY Valve, Race Master, Exhaust, 31mm Head Dia, 0.2345 in. Stem Dia, 4.274 Length, For Ford 5.0L, Set of 8

MANLEY Valve, Race Master, Exhaust, 31mm Head Dia, 0.2345 in. Stem Dia, 4.274 Length, For Ford 5.0L, Set of 8

$408.60