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, Custom, Titanium, .3415 in. Stem Dia, Each

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Each

$326.62

MANLEY Valve, Severe Duty, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.446 in. Length, For Ford, Each

MANLEY Valve, Severe Duty, Intake, 2.19 in. Head Dia, 0.3715 in. Stem Dia, 5.446 in. Length, For Ford, Each

$85.97

MANLEY Valve, Titanium, Intake, Bead Loc, 2.3 in. Head Dia, 0.3415 in. Stem Dia, 5.5 in. Length, Set of 8

MANLEY Valve, Titanium, Intake, Bead Loc, 2.3 in. Head Dia, 0.3415 in. Stem Dia, 5.5 in. Length, Set of 8

$2,603.48

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Each

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Each

$323.90

MANLEY Valve, Severe Duty, Exhaust, Bead Loc, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 5.522 in. Length, Each

MANLEY Valve, Severe Duty, Exhaust, Bead Loc, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 5.522 in. Length, Each

$75.93

MANLEY Valve, Budget Replacement, Exhaust, 1.5 in. Head Dia, 0.3415 in. Stem Dia, 4.92 in. Length, SBC, Set of 8

MANLEY Valve, Budget Replacement, Exhaust, 1.5 in. Head Dia, 0.3415 in. Stem Dia, 4.92 in. Length, SBC, Set of 8

$150.04