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

Overview

Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.

Details

Head Diameter: 1.575 in. - Stem Diameter: .3136 in. - O/A : 4.923

Specifications

Head Diameter

1.575 in. - Stem Diameter: .3136 in. - O/A : 4.923

Part Type

Engine Exhaust Valve

Weight

2.1 lb

Box Dimensions

11.6 × 6.6 × 2.6 in