Manley Chevy LS-1/LS-2 Small Block 1.575 Pro Flo Severe Duty Exhaust Valves (Set of 8)

The Manley Performance Chevy LS-1/LS-2 Small Block 1.575 Pro Flo Severe Duty Exhaust Valves are high-performance replacement valves designed for extreme engine conditions. Crafted from exclusive materials—XH-428 for exhaust and NK-844 for intake—they provide unmatched tensile strength and durability. Engineered for reliability under high temperatures, these valves have undergone fatigue testing at 40,000 psi and 1400°F, enduring over 100 million cycles, significantly surpassing competitor performance. Features include chrome stems, hard tips, swirl-polished underheads, and fully machined combustion faces, all contributing to superior airflow, efficiency, and wear resistance. Built for demanding applications, these valves set a new industry standard for strength and longevity in performance engines.

Designed for Chevrolet LS-1 and LS-2 small block engines, these valves are suitable for models with 4.8L, 5.3L, 5.7L, and 6.0L engines, typically from the early 2000s to mid-2000s. They serve as direct replacements or upgrades for stock exhaust valves, ideal for race, performance, or high-stress street applications. The set includes eight valves, ensuring complete coverage for a standard V8 engine. Installation involves replacing existing valves with these severe-duty components, providing enhanced durability and performance under extreme conditions. These valves are perfect for enthusiasts seeking race-winning strength and long-lasting reliability in their Chevrolet small block builds.