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 Master, Exhaust, 32.0mm Head Dia, 0.313 in. Stem Dia, 4.405 in. Length, Volkswagen, Set of 4

MANLEY Valve, Race Master, Exhaust, 32.0mm Head Dia, 0.313 in. Stem Dia, 4.405 in. Length, Volkswagen, Set of 4

$190.33

MANLEY Valve, Pro Flo, Intake, 2.165 in. Head Dia, 0.3133 in. Stem Dia, 5.2 in. Length, For Chevrolet L92, Set of 8

MANLEY Valve, Pro Flo, Intake, 2.165 in. Head Dia, 0.3133 in. Stem Dia, 5.2 in. Length, For Chevrolet L92, Set of 8

$607.34

MANLEY Install Inserted Tip, Set of 8

MANLEY Install Inserted Tip, Set of 8

$94.02

MANLEY Valve, Race Flo, Intake, 33.0 mm Head Dia, 5.5 mm Stem Dia, 102.40 mm Length, For Honda, Each

MANLEY Valve, Race Flo, Intake, 33.0 mm Head Dia, 5.5 mm Stem Dia, 102.40 mm Length, For Honda, Each

$49.91

MANLEY Valve, Street Flo, Exhaust, 1.5 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Set of 8

MANLEY Valve, Street Flo, Exhaust, 1.5 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Set of 8

$280.36