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, 30.15 mm Head Dia, 7 mm Stem Dia, 101.52 mm Length, For Nissan RB26, Set of 12

MANLEY Valve, Race Master, Exhaust, 30.15 mm Head Dia, 7 mm Stem Dia, 101.52 mm Length, For Nissan RB26, Set of 12

$849.04

MANLEY Valve, Race Master, Exhaust, 1.9 in. Head Dia, 0.3715 in. Stem Dia, 5.522 in. Length, BBC, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.9 in. Head Dia, 0.3715 in. Stem Dia, 5.522 in. Length, BBC, Set of 8

$380.66

Sonnax Oversized Pressure Regulator Valve, GM, 4L60E, 4L65E, 4L70E, Each

Sonnax Oversized Pressure Regulator Valve, GM, 4L60E, 4L65E, 4L70E, Each

$36.88

MANLEY Valve, Street Flo, Intake, 2 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

MANLEY Valve, Street Flo, Intake, 2 in. Head Dia, 0.3415 in. Stem Dia, 4.911 in. Length, SBC, Each

$35.04

MANLEY Valve, Race Flo, Intake, 29 mm Head Dia, 5.5 mm Stem Dia, 115.00 mm Length, For Honda, Set of 8

MANLEY Valve, Race Flo, Intake, 29 mm Head Dia, 5.5 mm Stem Dia, 115.00 mm Length, For Honda, Set of 8

$399.33