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, 1.6 in. Head Dia., 0.311 in. Stem Dia., 5.87 in. Length, For Dodge, Each

MANLEY Valve, Race Master, Exhaust, 1.6 in. Head Dia., 0.311 in. Stem Dia., 5.87 in. Length, For Dodge, Each

$36.27

View
MANLEY Valve, Race Master, Exhaust, 1.575 in. Head Dia., 0.3125 in. Stem Dia., 5.125 in. Length, For Chrysler HEMI, Set of 8

MANLEY Valve, Race Master, Exhaust, 1.575 in. Head Dia., 0.3125 in. Stem Dia., 5.125 in. Length, For Chrysler HEMI, Set of 8

$290.09

View
MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.6 in. Head Dia., 0.3415 in. Stem Dia., 5.95 in. Length, Set of 8

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.6 in. Head Dia., 0.3415 in. Stem Dia., 5.95 in. Length, Set of 8

$1,818.96

View
MANLEY Valve, Race Master, Exhaust, 40 mm Head Dia., 6.96 mm Stem Dia., 100.21 mm Length, For Nissan Patrol, Set of 12

MANLEY Valve, Race Master, Exhaust, 40 mm Head Dia., 6.96 mm Stem Dia., 100.21 mm Length, For Nissan Patrol, Set of 12

$662.50

View
MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia., Each

MANLEY Valve, Custom, Titanium, .3415 in. Stem Dia., Each

$206.22

View
MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia., Set of 8

MANLEY Valve, Custom, Titanium, .3110 in. Stem Dia., Set of 8

$1,809.16

View