Manley Extreme Duty Series performance steel valves are a great choice for supercharged, alcohol-burning, or high-revving engines. These engines generate a lot of heat and require special valves that can handle that kind of punishment. All valves are made from the best stainless steel available, with chrome stems and hardened valve tips. Extreme Duty Series valves are swirl-polished and fully machined and available with either undercut heads or straight stems.

More From This Category

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Height, Each

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.14 in. Height, Each

$307.70

MANLEY Valve, Race Master, Intake, Bead Loc, 38mm Head Dia, 0.275 in. Stem Dia, 5.339 Length, For Ford, Each

MANLEY Valve, Race Master, Intake, Bead Loc, 38mm Head Dia, 0.275 in. Stem Dia, 5.339 Length, For Ford, Each

$51.07

MANLEY Valve, Street Flo, Exhaust, 1.88 in. Head Dia, 0.3715 in. Stem Dia, 5.35 in. Length, BBC, Set of 8

MANLEY Valve, Street Flo, Exhaust, 1.88 in. Head Dia, 0.3715 in. Stem Dia, 5.35 in. Length, BBC, Set of 8

$299.37

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.56 in. Height, Set of 8

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.56 in. Height, Set of 8

$2,564.57

MANLEY Valve, Race Master, Exhaust, 1.75 in. Head Dia, 0.3715 in. Stem Dia, 5.105 in. Length, For Chevrolet 409, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.75 in. Head Dia, 0.3715 in. Stem Dia, 5.105 in. Length, For Chevrolet 409, Set of 8

$380.66

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.36 in. Height, Each

MANLEY Valve, Titanium, Exhaust, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.36 in. Height, Each

$307.70