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, Intake, Bead Loc, 2.205 in. Head Dia., 0.3135 in. Stem Dia., 5.205 in. Length, For Chevrolet LS7, Set of 8

MANLEY Valve, Titanium, Intake, Bead Loc, 2.205 in. Head Dia., 0.3135 in. Stem Dia., 5.205 in. Length, For Chevrolet LS7, Set of 8

$1,717.79

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

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

$1,809.16

View
MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.65 in. Head Dia., 0.3415 in. Stem Dia., 5.46 in. Height, Each

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.65 in. Head Dia., 0.3415 in. Stem Dia., 5.46 in. Height, Each

$218.25

View
MANLEY Valve, Race Flo, Intake, 2.08 in. Head Dia., 0.3133 in. Stem Dia., 4.874 in. Length, For Chevrolet LS1, Each

MANLEY Valve, Race Flo, Intake, 2.08 in. Head Dia., 0.3133 in. Stem Dia., 4.874 in. Length, For Chevrolet LS1, Each

$34.49

View
Sonnax Oversized B4 Release Valve Kit, Aisin Aw, Aw55-50Sn, Aw55-51Sn, Each

Sonnax Oversized B4 Release Valve Kit, Aisin Aw, Aw55-50Sn, Aw55-51Sn, Each

$51.68

View
MANLEY Valve, Intake, Bead Loc, 2.4 in. Head Dia., 0.3415 in. Stem Dia., 6.04 in. Length, Set of 8

MANLEY Valve, Intake, Bead Loc, 2.4 in. Head Dia., 0.3415 in. Stem Dia., 6.04 in. Length, Set of 8

$1,877.22

View