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 Pressure Regulator Valve Kit, Chrysler, 45RFE/545RFE/65RFE/66RFE/68RFE, Each

Sonnax Oversized Pressure Regulator Valve Kit, Chrysler, 45RFE/545RFE/65RFE/66RFE/68RFE, Each

$76.94

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.46 in. Length, Each

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.625 in. Head Dia, 0.3415 in. Stem Dia, 5.46 in. Length, Each

$307.70

MANLEY Valve, Race Master, Intake, 45.5mm Head Dia, 0.275 in. Stem Dia, 4.705 Length, For Ford, Set of 8

MANLEY Valve, Race Master, Intake, 45.5mm Head Dia, 0.275 in. Stem Dia, 4.705 Length, For Ford, Set of 8

$408.60

MANLEY Valve, Extreme/Severe Duty, Exhaust, 2.06 in. Head Dia, 0.3415 in. Stem Dia, 6.7 in. Length, Gen II, Each

MANLEY Valve, Extreme/Severe Duty, Exhaust, 2.06 in. Head Dia, 0.3415 in. Stem Dia, 6.7 in. Length, Gen II, Each

$85.44

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.64 in. Length, For Chevrolet SB, Each

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia, 0.311 in. Stem Dia, 5.64 in. Length, For Chevrolet SB, Each

$51.07

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.221 in. Length, SBC, Set of 8

MANLEY Valve, Severe Duty, Exhaust, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 5.221 in. Length, SBC, Set of 8

$607.34