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, Severe Duty, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.54 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.54 in. Length, SBC, Set of 8

$607.34

MILODON Valve, Intake, Race, Stainless Steel, 2.02 in. Diameter, +.100 Long, For Chevrolet, Small Block, 350, 383, 400, Each

MILODON Valve, Intake, Race, Stainless Steel, 2.02 in. Diameter, +.100 Long, For Chevrolet, Small Block, 350, 383, 400, Each

$57.67

MANLEY Valve, Titanium, Intake, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Height, Set of 8

MANLEY Valve, Titanium, Intake, 2.125 in. Head Dia, 0.3415 in. Stem Dia, 5.24 in. Height, Set of 8

$2,421.90

Sonnax Oversized Pressure Regulator Valve Kit, GM, 6T70/75/80 Gen II, Each

Sonnax Oversized Pressure Regulator Valve Kit, GM, 6T70/75/80 Gen II, Each

$66.55

Trick Flow Valves, Intake, Stainless Steel, 2.020 in. Diameter, 8.0mm Stem, 4.900 in. Length, GM LS, Set of 8

Trick Flow Valves, Intake, Stainless Steel, 2.020 in. Diameter, 8.0mm Stem, 4.900 in. Length, GM LS, Set of 8

$434.97