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

FAST Red Billet Fuel Rail Kit for LS1 and LS6 LSXr 102mm Intake Manifolds

FAST Red Billet Fuel Rail Kit for LS1 and LS6 LSXr 102mm Intake Manifolds

$517.97

Manley Piston Set, 1.550 CD/FT 4.065, Set of 8

Manley Piston Set, 1.550 CD/FT 4.065, Set of 8

$1,578.97

Snow Performance Stage 2 Boost Cooler? 102Mm Ls Water-Methanol Injection System

Snow Performance Stage 2 Boost Cooler? 102Mm Ls Water-Methanol Injection System

$1,658.36

TURBOSMART Gen4 WG38 UltraGate Top Cap Replacement, Black, Each

TURBOSMART Gen4 WG38 UltraGate Top Cap Replacement, Black, Each

$102.25