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. Image is a representation. Actual product may vary

More From This Category

MANLEY Valve, Titanium, Intake, 2.45 in. Head Dia., 0.3415 in. Stem Dia., 6.6 in. Length, For Pontiac, Each

MANLEY Valve, Titanium, Intake, 2.45 in. Head Dia., 0.3415 in. Stem Dia., 6.6 in. Length, For Pontiac, Each

$226.16

View
MANLEY Valve, Race Master, Intake, 2.25 in. Head Dia., 0.3415 in. Stem Dia., 5.344 in. Length, BBC, Set of 8

MANLEY Valve, Race Master, Intake, 2.25 in. Head Dia., 0.3415 in. Stem Dia., 5.344 in. Length, BBC, Set of 8

$275.90

View
MANLEY Valve, Titanium, All Pro 1.600 in. Head Dia., .3110 in. Stem Dia., Set of 8

MANLEY Valve, Titanium, All Pro 1.600 in. Head Dia., .3110 in. Stem Dia., Set of 8

$1,745.98

View
MANLEY Valve, Extreme/Severe Duty, Intake, 2.2 in. Head Dia., 0.274 in. Stem Dia., 5.6 in. Length, Gen II, Each

MANLEY Valve, Extreme/Severe Duty, Intake, 2.2 in. Head Dia., 0.274 in. Stem Dia., 5.6 in. Length, Gen II, Each

$67.71

View
MANLEY Valve, Race Master, Exhaust, 30.15 mm Head Dia., 6 mm Stem Dia., 102.40 mm Length, Set of 8

MANLEY Valve, Race Master, Exhaust, 30.15 mm Head Dia., 6 mm Stem Dia., 102.40 mm Length, Set of 8

$289.53

View
Sonnax Oversized Secondary Pulley Reducing Valve Kit, JF016E & JF017E, Each

Sonnax Oversized Secondary Pulley Reducing Valve Kit, JF016E & JF017E, Each

$76.14

View