These Extreme/Severe Duty Gen II custom valves with unmatched strength and superiority are the only valves of their kind. Exhaust material XH-428 and intake material NK-844 are paired together for ultimate dominance over all others. With four times the tensile strength of competitors' intake valves and supremely better fatigue life, Manley Severe Duty Gen II custom valves truly show their commitment to seeing that you're there at the finish. You decide the head diameter and seat and margin widths, as well as valve length, groove type, and location for the perfect custom setup! Image is a representation. Actual product may vary

More From This Category

MANLEY Valve, Race Master, Exhaust, 1.625 in. Head Dia., 0.3715 in. Stem Dia., 4.97 in. Length, For Chrysler SB, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.625 in. Head Dia., 0.3715 in. Stem Dia., 4.97 in. Length, For Chrysler SB, Set of 8

$275.90

View
MANLEY Valve, Race Master, Exhaust, 34.0 mm Head Dia., 7 mm Stem Dia., 99 mm Length, For Toyota 1FZ-FE, Each

MANLEY Valve, Race Master, Exhaust, 34.0 mm Head Dia., 7 mm Stem Dia., 99 mm Length, For Toyota 1FZ-FE, Each

$49.80

View
MANLEY Valve, Titanium, Intake, Bead Loc, 2.25 in. Head Dia., 0.3415 in. Stem Dia., 5.5 in. Length, Set of 8

MANLEY Valve, Titanium, Intake, Bead Loc, 2.25 in. Head Dia., 0.3415 in. Stem Dia., 5.5 in. Length, Set of 8

$1,809.16

View
MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia., 0.3415 in. Stem Dia., 4.911 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia., 0.3415 in. Stem Dia., 4.911 in. Length, SBC, Set of 8

$448.82

View
MANLEY Valve, Titanium, Intake, Bead Loc, 2.2 in. Head Dia., 0.311 in. Stem Dia., 6.25 in. Length, Each

MANLEY Valve, Titanium, Intake, Bead Loc, 2.2 in. Head Dia., 0.311 in. Stem Dia., 6.25 in. Length, Each

$283.50

View
MANLEY Valve, Race Flo, Intake, 32.0 mm Head Dia., 6 mm Stem Dia., 99.60 mm Length, Each

MANLEY Valve, Race Flo, Intake, 32.0 mm Head Dia., 6 mm Stem Dia., 99.60 mm Length, Each

$36.19

View