Manley Severe Duty Pro Flo 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 offer improved flow with undercut "Pro Flo" stems.

More From This Category

MANLEY Valve, Severe Duty, Exhaust, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 5.522 in. Length, BBC, Set of 8

MANLEY Valve, Severe Duty, Exhaust, 1.9 in. Head Dia, 0.3415 in. Stem Dia, 5.522 in. Length, BBC, Set of 8

$607.34

AFR Exhaust Valve, BBC 24° Stainless Steel 1.880 x 5.450 O.A.L. 11/32 Stem (Nail Head) Race, Ea.

AFR Exhaust Valve, BBC 24° Stainless Steel 1.880 x 5.450 O.A.L. 11/32 Stem (Nail Head) Race, Ea.

$55.65

AFR Intake Valve, BBC 18° 11/32" Stainless Steel 2.400 X 6.035 O.A.L. Race, Set

AFR Intake Valve, BBC 18° 11/32" Stainless Steel 2.400 X 6.035 O.A.L. Race, Set

$486.94

MANLEY Valve, Race Master, Intake, 2.19 in. Head Dia, 0.3415 in. Stem Dia, 5.244 in. Length, For Ford 351C, Each

MANLEY Valve, Race Master, Intake, 2.19 in. Head Dia, 0.3415 in. Stem Dia, 5.244 in. Length, For Ford 351C, Each

$47.58

AFR Intake Valve, BBC 24° Stainless Steel 2.250 x 5.500 O.A.L 11/32 Stem Race, Set

AFR Intake Valve, BBC 24° Stainless Steel 2.250 x 5.500 O.A.L 11/32 Stem Race, Set

$436.85