Manley Severe Duty series performance valves are a great choice for your high performance or race engine. All valves are made from stainless steel (intakes are NK-844; exhausts are XH-428) with chrome stems and hardened valve tips. Severe Duty series valves are made of superior materials, are fully machined and swirl polished, and are available with either undercut "Pro Flo" stems or straight stems.

More From This Category

Sonnax Tcc Regulator Valve Kit, GM, 4T80-E, Each

Sonnax Tcc Regulator Valve Kit, GM, 4T80-E, Each

$110.06

MANLEY Valve, Extreme/Severe Duty, Intake, 2.4 in. Head Dia, 0.3415 in. Stem Dia, 6.6 in. Length, BBC, Each

MANLEY Valve, Extreme/Severe Duty, Intake, 2.4 in. Head Dia, 0.3415 in. Stem Dia, 6.6 in. Length, BBC, Each

$78.54

MANLEY Valve, Titanium, NRE Super 6+ Exhaust, Bead Loc, Set of 8

MANLEY Valve, Titanium, NRE Super 6+ Exhaust, Bead Loc, Set of 8

$3,264.97

Sonnax Oversized Clutch Boost Valve, GM 6T30/40/45/50 (Gen. 1), Each

Sonnax Oversized Clutch Boost Valve, GM 6T30/40/45/50 (Gen. 1), Each

$59.18

MANLEY Valve, Race Master, Intake, 1.94 in. Head Dia, 0.311 in. Stem Dia, 5.01 in. Length, For Chevrolet SB, Set of 8

MANLEY Valve, Race Master, Intake, 1.94 in. Head Dia, 0.311 in. Stem Dia, 5.01 in. Length, For Chevrolet SB, Set of 8

$408.60

MANLEY Valve, Titanium, Intake, Bead Loc, 2.3 in. Head Dia, 0.3415 in. Stem Dia, 5.54 in. Length, Set of 8

MANLEY Valve, Titanium, Intake, Bead Loc, 2.3 in. Head Dia, 0.3415 in. Stem Dia, 5.54 in. Length, Set of 8

$2,603.48