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

Sonnax Oversized Secondary Pressure Regulator Valve Kit, Aisin Aw, Aw Tf-80/81Sc Fwd 6Sp, Each

Sonnax Oversized Secondary Pressure Regulator Valve Kit, Aisin Aw, Aw Tf-80/81Sc Fwd 6Sp, Each

$126.35

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

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

$350.52

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 6.49 in. Length, For Pontiac, Each

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 6.49 in. Length, For Pontiac, Each

$325.41

Sonnax Oversized Pressure Regulator Valve Kit, Ford, Axode, Ax4S, Ax4N, 4F50N, Each

Sonnax Oversized Pressure Regulator Valve Kit, Ford, Axode, Ax4S, Ax4N, 4F50N, Each

$60.86

MANLEY Valve, Titanium, Intake, 2.4 in. Head Dia, 0.3415 in. Stem Dia, 6.4 in. Length, Set of 8

MANLEY Valve, Titanium, Intake, 2.4 in. Head Dia, 0.3415 in. Stem Dia, 6.4 in. Length, Set of 8

$3,264.97

Sonnax Oversized Tcc Apply Valve Kit, VW 01M, 01N, 01P, Each

Sonnax Oversized Tcc Apply Valve Kit, VW 01M, 01N, 01P, Each

$84.31