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, Pro Flo, Intake, 2.08 in. Head Dia, 0.3133 in. Stem Dia, 4.935 in. Length, For Chevrolet SB, Set of 8

MANLEY Valve, Pro Flo, Intake, 2.08 in. Head Dia, 0.3133 in. Stem Dia, 4.935 in. Length, For Chevrolet SB, Set of 8

$628.35

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Each

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia, Each

$318.84

MANLEY Valve, Extreme Duty, Exhaust, 37.5mm Head Dia, 0.2345 in. Stem Dia, 4.585 Length, For Ford, Each

MANLEY Valve, Extreme Duty, Exhaust, 37.5mm Head Dia, 0.2345 in. Stem Dia, 4.585 Length, For Ford, Each

$129.64

Sonnax Oversized C2 Apply Control Valve Kit, U660E/F, U760E/F, Each

Sonnax Oversized C2 Apply Control Valve Kit, U660E/F, U760E/F, Each

$88.71

MANLEY Valve, Pro Flo, Intake, 2.055 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

MANLEY Valve, Pro Flo, Intake, 2.055 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

$75.93

MANLEY Valve, Titanium, Intake, 2.15 in. Head Dia, 0.3415 in. Stem Dia, 5.44 in. Height, Each

MANLEY Valve, Titanium, Intake, 2.15 in. Head Dia, 0.3415 in. Stem Dia, 5.44 in. Height, Each

$302.72