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, 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, Intake, 43.7mm Head Dia, 0.313 in. Stem Dia, 4.405 in. Length, Volkswagen, Each

MANLEY Valve, Race Master, Intake, 43.7mm Head Dia, 0.313 in. Stem Dia, 4.405 in. Length, Volkswagen, Each

$47.58

COMP Cams Valve, Sportsman, Stainless Steel, Intake, For Chevrolet Small Block, 2.080 in. Head, 5.111 in. Length, Set of 8

COMP Cams Valve, Sportsman, Stainless Steel, Intake, For Chevrolet Small Block, 2.080 in. Head, 5.111 in. Length, Set of 8

$250.07

Sonnax Oversized Secondary Regulator Valve Kit, Aisin Aw, Aw55-50Sn, Aw55-51Sn, Each

Sonnax Oversized Secondary Regulator Valve Kit, Aisin Aw, Aw55-50Sn, Aw55-51Sn, Each

$65.52

MANLEY Valve, Titanium, Intake, Bead Loc, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Height, Each

MANLEY Valve, Titanium, Intake, Bead Loc, 2.08 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Height, Each

$302.72

MILODON Valves, Exhaust, Race, Stainless Steel, 1.66 in. Dia, For Pontiac, 1959-67, 326, 350, 389, 400, 421, 455, Set of 8

MILODON Valves, Exhaust, Race, Stainless Steel, 1.66 in. Dia, For Pontiac, 1959-67, 326, 350, 389, 400, 421, 455, Set of 8

$407.16