Specifications
- Brand
- Manley Performance
- Part #
- 11680-8
- UPC
- 807298051482

Manley Chevy LS-1 Small Block 2.055 Pro Flo Severe Duty Exhaust Valves (Set of 8)
$349.40
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Manley Pro Flo Severe Duty exhaust valves for Chevy LS-1 Small Block engines. Made from XH-428 material for high-temp performance.
Key Features
- Fits Chevy LS-1 Small Block engines.
- Exhaust valves are made from XH-428 material, offering superior high-temperature tensile strength.
- Each valve has a 2.055-inch head diameter and a .3133-inch stem diameter.
- Features chrome stems and hard tips for added durability.
- Swirl polished under-head areas and fully machined combustion faces improve airflow.
- Tested to endure up to 100 million cycles at 40,000 psi and 1400°F.
Product Details
Manley's Pro Flo Severe Duty exhaust valves are built from XH-428 material, a choice that offers nearly double the ultimate tensile strength at 1500°F compared to competing EV-8 materials. These valves are specifically designed for high-temperature gasoline engines, ensuring they can handle the demanding conditions found in performance applications. Each valve features a 2.055-inch head diameter and a .3133-inch stem diameter, with an overall length of 4.874 inches.
The construction includes chrome stems and hard tips, which add to their durability and longevity. For improved airflow and combustion efficiency, the under-head areas are swirl polished, and the combustion faces are fully machined. Rigorous fatigue testing shows these valves can endure up to 100 million cycles at 40,000 psi and 1400°F, significantly outperforming competitors that fail much sooner. This makes them a solid option for anyone rebuilding or upgrading their LS-1 small block Chevy engine.
Specifications
- Brand
- Manley Performance
- Manufacturer Part #
- 11680-8
- UPC
- 807298051482
Frequently Asked Questions
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Manley Chevy LS-1 Small Block 2.055 Pro Flo Severe Duty Exhaust Valves (Set of 8)
