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, Intake, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Height, Each

MANLEY Valve, Titanium, Intake, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Height, Each

$302.72

Sonnax Boost Valve Kit, Aisin Aw, Aw450-43Le, Each

Sonnax Boost Valve Kit, Aisin Aw, Aw450-43Le, Each

$125.70

MANLEY Valve, Race Master, Intake, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 4.951 in. Length, SBC, Set of 8

MANLEY Valve, Race Master, Intake, 1.94 in. Head Dia, 0.3415 in. Stem Dia, 4.951 in. Length, SBC, Set of 8

$380.66

MANLEY Valve, Extreme Duty, Exhaust, 1.88 in. Head Dia, 0.3715 in. Stem Dia, 5.354 in. Length, BBC, Each

MANLEY Valve, Extreme Duty, Exhaust, 1.88 in. Head Dia, 0.3715 in. Stem Dia, 5.354 in. Length, BBC, Each

$129.64

MANLEY Valve, Race Flo, Intake, 2.165 in. Head Dia, 0.3133 in. Stem Dia, 4.9 in. Length, For Chevrolet L92, Each

MANLEY Valve, Race Flo, Intake, 2.165 in. Head Dia, 0.3133 in. Stem Dia, 4.9 in. Length, For Chevrolet L92, Each

$51.07