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, Race Master, Exhaust, 2.1 in. Head Dia., 0.31 in. Stem Dia., 5.4 in. Length, Gen II, Set of 8

MANLEY Valve, Race Master, Exhaust, 2.1 in. Head Dia., 0.31 in. Stem Dia., 5.4 in. Length, Gen II, Set of 8

$421.46

Trick Flow Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.160 in. Length, Small For Ford, Each

Trick Flow Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.160 in. Length, Small For Ford, Each

$49.90

MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia., 0.311 in. Stem Dia., 5.244 in. Length, For Chevrolet BB, Each

MANLEY Valve, Severe Duty, Intake, 2.25 in. Head Dia., 0.311 in. Stem Dia., 5.244 in. Length, For Chevrolet BB, Each

$58.03

Sonnax Tcc Regulator Valve Kit, Chrysler, 45/545/65/68RFE, Each

Sonnax Tcc Regulator Valve Kit, Chrysler, 45/545/65/68RFE, Each

$53.13

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia., 0.3136 in. Stem Dia., 5.05 in. Length, For Chevrolet SB, Each

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia., 0.3136 in. Stem Dia., 5.05 in. Length, For Chevrolet SB, Each

$56.11

Sonnax Tcc Apply Valve Kit, GM, 4L60E, 4L65E, 4L70E, Each

Sonnax Tcc Apply Valve Kit, GM, 4L60E, 4L65E, 4L70E, Each

$33.19