What material are these Manley intake valves made from?

These Manley Severe Duty intake valves are made from NK-844 material. Manley states this material offers significantly higher tensile strength at high temperatures compared to many competitor materials.

What is the benefit of the swirl-polished under-head areas?

The swirl-polished under-head areas are designed to help improve the flow of the air-fuel mixture into the cylinder. This can contribute to more efficient combustion and potentially better engine performance.

Are these valves suitable for all types of gasoline engines?

These valves are specifically designed for high-temperature gasoline engines. Their robust construction and material properties make them well-suited for demanding applications where heat and stress are significant factors.

Specifications

Brand: Manley Performance
Part #: 11882-8
UPC: 807298054711

Manley Chevrolet 2.020 Dia Dish 5.026 O/A Length Severe Duty Intake Valves (Set of 8)

Name: Manley Chevrolet 2.020 Dia Dish 5.026 O/A Length Severe Duty Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-2-020-dia-dish-5-026-o-a-length-severe-duty--t14-4338629
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley Severe Duty Intake Valves for Chevrolet engines. These well-built valves offer improved durability and performance for high-temperature gasoline applications.

Key Features

Set of 8 intake valves for Chevrolet engines.
Features a 2.020-inch diameter and 5.026-inch overall length.
Constructed from NK-844 material for high tensile strength at elevated temperatures.
Designed for high-temperature gasoline engines.
Includes chrome stems and hard tips for enhanced durability.
Swirl-polished under-head areas and fully machined combustion faces improve airflow.

These valves are designed for Chevrolet engines. Please consult manufacturer fitment data to confirm compatibility with your specific vehicle and engine configuration.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

These Manley Severe Duty intake valves feature a 2.020-inch diameter and a 5.026-inch overall length, designed specifically for Chevrolet engines. They are constructed from NK-844 material, which Manley states has over four times the ultimate tensile strength of competing intake valve materials at 1000°F. This makes them a strong option for high-temperature gasoline engines where durability and consistent performance are key.

The design includes swirl-polished under-head areas and fully machined combustion faces, which help improve airflow into the cylinder and contribute to more efficient combustion. Additionally, the valves are fitted with chrome stems and hard tips, adding to their overall longevity and resistance to wear, especially in demanding operating conditions. Rigorous fatigue testing has shown these valves can endure up to 100 million cycles, significantly outperforming many competitors.

This set includes eight intake valves, providing a complete solution for a typical V8 engine rebuild or upgrade. If you're working on a high-performance or heavy-duty Chevrolet application, these valves are built to handle the stress.