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, Extreme/Severe Duty, Exhaust, 1.625 in. Head Dia, 0.311 in. Stem Dia, 6.4 in. Length, Gen II, Each

MANLEY Valve, Extreme/Severe Duty, Exhaust, 1.625 in. Head Dia, 0.311 in. Stem Dia, 6.4 in. Length, Gen II, Each

$72.68

AFR Exhaust Valve, SBF 8MM Stainless Steel 1.600 X 5.100 O.A.L. Pedestal Race, Set

AFR Exhaust Valve, SBF 8MM Stainless Steel 1.600 X 5.100 O.A.L. Pedestal Race, Set

$322.77

MANLEY Valve, Race Flo, Intake, 2.05 in. Head Dia, 0.3125 in. Stem Dia, 5.176 in. Length, For Chrysler HEMI, Each

MANLEY Valve, Race Flo, Intake, 2.05 in. Head Dia, 0.3125 in. Stem Dia, 5.176 in. Length, For Chrysler HEMI, Each

$50.05

Manley Valve, TI, 1.600,+.200, Set of 8

Manley Valve, TI, 1.600,+.200, Set of 8

$2,366.98

MANLEY Valve, Race Flo, Intake, 2.11 in. Head Dia, 0.3415 in. Stem Dia, 5.215 in. Length, For Pontiac, Each

MANLEY Valve, Race Flo, Intake, 2.11 in. Head Dia, 0.3415 in. Stem Dia, 5.215 in. Length, For Pontiac, Each

$47.58

MANLEY Valve, Race Master, Exhaust, Bead Loc, 1.555 in. Head Dia, 0.3125 in. Stem Dia, 5.125 in. Length, For Chrysler HEMI, Set of 8

MANLEY Valve, Race Master, Exhaust, Bead Loc, 1.555 in. Head Dia, 0.3125 in. Stem Dia, 5.125 in. Length, For Chrysler HEMI, Set of 8

$400.37