These 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!

More From This Category

MANLEY Valve, Severe Duty, Exhaust, 1.56 in. Head Dia, 0.3136 in. Stem Dia, 5.208 in. Length, For Chevrolet L83, Each

MANLEY Valve, Severe Duty, Exhaust, 1.56 in. Head Dia, 0.3136 in. Stem Dia, 5.208 in. Length, For Chevrolet L83, Each

$75.93

MANLEY Valve, Race Flo, Intake, 35.5 mm Head Dia, 5.5 mm Stem Dia, 106.65 mm Length, For Honda, Set of 8

MANLEY Valve, Race Flo, Intake, 35.5 mm Head Dia, 5.5 mm Stem Dia, 106.65 mm Length, For Honda, Set of 8

$399.33

MANLEY Valve, Race Master, Exhaust, 31.0 mm Head Dia, 5.5 mm Stem Dia, 109.04 mm Length, For Honda, Each

MANLEY Valve, Race Master, Exhaust, 31.0 mm Head Dia, 5.5 mm Stem Dia, 109.04 mm Length, For Honda, Each

$49.91

MANLEY Valve, Extreme Duty, Exhaust, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 5.422 in. Length, BBC, Set of 8

MANLEY Valve, Extreme Duty, Exhaust, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 5.422 in. Length, BBC, Set of 8

$1,037.08

Sonnax Oversized Tcc Control Valve Kit, Ford 6F35 (Gen. 1 & 2), Each

Sonnax Oversized Tcc Control Valve Kit, Ford 6F35 (Gen. 1 & 2), Each

$107.06

MANLEY Valve, Race Master, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.244 in. Length, BBC, Set of 8

MANLEY Valve, Race Master, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.244 in. Length, BBC, Set of 8

$380.66