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. Image is a representation. Actual product may vary

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, Street Flo, Intake, 2.055 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

MANLEY Valve, Street Flo, Intake, 2.055 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

$35.04

MANLEY Valve, Severe Duty, Exhaust, 1.9 in. Head Dia, 0.3715 in. Stem Dia, 5.464 in. Length, BBC, Set of 8

MANLEY Valve, Severe Duty, Exhaust, 1.9 in. Head Dia, 0.3715 in. Stem Dia, 5.464 in. Length, BBC, Set of 8

$607.34

MANLEY Valve, Race Master, Exhaust, 30.15 mm Head Dia, 6 mm Stem Dia, 102.40 mm Length, Set of 8

MANLEY Valve, Race Master, Exhaust, 30.15 mm Head Dia, 6 mm Stem Dia, 102.40 mm Length, Set of 8

$399.33