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

AFR Intake Valve, SBF 8MM Stainless Steel 1.900 X 5.080 O.A.L. Pedestal Race, Ea.

AFR Intake Valve, SBF 8MM Stainless Steel 1.900 X 5.080 O.A.L. Pedestal Race, Ea.

$38.96

AFR Intake Valve, SBC/SBF 8mm Stainless Steel 2.050 X 4.900 O.A.L. Race, Ea.

AFR Intake Valve, SBC/SBF 8mm Stainless Steel 2.050 X 4.900 O.A.L. Race, Ea.

$38.96

Trick Flow Valve, Intake, Stainless Steel, 1.840 in. Diameter, 7.0mm Stem, 119.38mm Length, For Ford 4.6L/5.4L, Each

Trick Flow Valve, Intake, Stainless Steel, 1.840 in. Diameter, 7.0mm Stem, 119.38mm Length, For Ford 4.6L/5.4L, Each

$59.02

MANLEY Valve, Severe Duty, Intake, 2.4 in. Head Dia, 0.311 in. Stem Dia, Hollow Stem, 6.3 in. Length, Gen II, Set of 8

MANLEY Valve, Severe Duty, Intake, 2.4 in. Head Dia, 0.311 in. Stem Dia, Hollow Stem, 6.3 in. Length, Gen II, Set of 8

$1,412.54

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 4.951 in. Length, SBC, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 4.951 in. Length, SBC, Set of 8

$380.66

MANLEY Valve, Extreme Duty, Exhaust, 1.56 in. Head Dia, 0.3136 in. Stem Dia, 5.208 in. Length, For Chevrolet L83, Set of 8

MANLEY Valve, Extreme Duty, Exhaust, 1.56 in. Head Dia, 0.3136 in. Stem Dia, 5.208 in. Length, For Chevrolet L83, Set of 8

$1,037.08