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, Race Master, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.14 in. Length, For Chevrolet SB, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.14 in. Length, For Chevrolet SB, Set of 8

$380.66

MANLEY Valve, Titanium, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.06 in. Height, Each

MANLEY Valve, Titanium, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.06 in. Height, Each

$307.70

MANLEY Valve, Race Master, Exhaust, 37.5mm Head Dia, 0.313 in. Stem Dia, 4.405 in. Length, Volkswagen, Set of 4

MANLEY Valve, Race Master, Exhaust, 37.5mm Head Dia, 0.313 in. Stem Dia, 4.405 in. Length, Volkswagen, Set of 4

$190.33

MANLEY Valve, Street Flo, Intake, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.04 in. Length, SBC, Each

MANLEY Valve, Street Flo, Intake, 2.1 in. Head Dia, 0.3415 in. Stem Dia, 5.04 in. Length, SBC, Each

$35.04