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, 38.5 mm Head Dia., 6.96 mm Stem Dia., 100.21 mm Length, For Nissan Patrol, Set of 12

MANLEY Valve, Race Flo, Intake, 38.5 mm Head Dia., 6.96 mm Stem Dia., 100.21 mm Length, For Nissan Patrol, Set of 12

$682.24

View
MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia., 0.372 in. Stem Dia., 5.325 in. Length, Each

MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia., 0.372 in. Stem Dia., 5.325 in. Length, Each

$58.03

View
MANLEY Valve, Race Master, Intake, 2.125 in. Head Dia., 0.3415 in. Stem Dia., 5.04 in. Length, For Chevrolet SB, Set of 8

MANLEY Valve, Race Master, Intake, 2.125 in. Head Dia., 0.3415 in. Stem Dia., 5.04 in. Length, For Chevrolet SB, Set of 8

$275.90

View
MANLEY Valve, Severe Duty, Intake, 2.055 in. Head Dia., 0.311 in. Stem Dia., 5.11 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Intake, 2.055 in. Head Dia., 0.311 in. Stem Dia., 5.11 in. Length, SBC, Set of 8

$448.82

View
MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.925 in. Head Dia., 0.3415 in. Stem Dia., 6.1 in. Length, Each

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.925 in. Head Dia., 0.3415 in. Stem Dia., 6.1 in. Length, Each

$282.27

View