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, Race Flo, Intake, 1.785 in. Head Dia, 0.342 in. Stem Dia, 5.075 in. Length, For Ford SB, Each

MANLEY Valve, Race Flo, Intake, 1.785 in. Head Dia, 0.342 in. Stem Dia, 5.075 in. Length, For Ford SB, Each

$47.58

MANLEY Valve, Titanium, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.26 in. Height, Set of 8

MANLEY Valve, Titanium, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.26 in. Height, Set of 8

$2,461.66

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 6.1 in. Length, Each

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 6.1 in. Length, Each

$318.84

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Set of 8

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia, Set of 8

$2,591.35

MANLEY Valve, Street Flo, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.165 in. Length, SBC, Set of 8

MANLEY Valve, Street Flo, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.165 in. Length, SBC, Set of 8

$280.36

MANLEY Valve, Race Master, Exhaust, Bead Loc, 31.5mm Head Dia, 0.2345 in. Stem Dia, 4.274 Length, For Ford 5.0L, Each

MANLEY Valve, Race Master, Exhaust, Bead Loc, 31.5mm Head Dia, 0.2345 in. Stem Dia, 4.274 Length, For Ford 5.0L, Each

$51.07