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, Titanium, Exhaust, 1.6 in. Head Dia., 0.3415 in. Stem Dia., 4.96 in. Height, Each

MANLEY Valve, Titanium, Exhaust, 1.6 in. Head Dia., 0.3415 in. Stem Dia., 4.96 in. Height, Each

$218.25

View
MANLEY Valve, Race Flo, Intake, 2.1 in. Head Dia., 0.3415 in. Stem Dia., 5.24 in. Length, SBC, Each

MANLEY Valve, Race Flo, Intake, 2.1 in. Head Dia., 0.3415 in. Stem Dia., 5.24 in. Length, SBC, Each

$34.49

View
MANLEY Valve, Severe Duty, Exhaust, 1.88 in. Head Dia., 0.311 in. Stem Dia., 5.422 in. Length, BBC, Each

MANLEY Valve, Severe Duty, Exhaust, 1.88 in. Head Dia., 0.311 in. Stem Dia., 5.422 in. Length, BBC, Each

$56.11

View
Sonnax Solenoid Modulator Valve Kit, Aisin Aw, Aw Tr-60Sn, 09D, Each

Sonnax Solenoid Modulator Valve Kit, Aisin Aw, Aw Tr-60Sn, 09D, Each

$113.43

View
MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia., 0.3415 in. Stem Dia., 5.494 in. Length, Each

MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia., 0.3415 in. Stem Dia., 5.494 in. Length, Each

$56.11

View