What material are these 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 competing intake valve materials.

Are these valves suitable for all types of engines?

These specific valves are designed for high-temperature gasoline engines, particularly Chevy Big Block applications. They are built to withstand the stresses of performance gasoline engines.

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

The swirl-polished under-head areas are designed to help improve airflow into the combustion chamber. This can contribute to better combustion efficiency and overall engine performance.

Specifications

Brand: Manley Performance
Part #: 11562-8
UPC: 807298050232

Manley Chevy Big Block Stock 3/8 inch Severe Duty Intake Valves (Set of 8)

Name: Manley Chevy Big Block Stock 3/8 inch Severe Duty Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-big-block-stock-3-8-inch-severe-duty-intake-valv-t14-308021
Price: 349.40 USD
Availability: BackOrder

$349.40

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Chevy Big Block Stock 3/8 inch Severe Duty Intake Valves (Set of 8). Built with NK-844 material for high-temperature gasoline engines.

Key Features

Set of 8 Manley Severe Duty? intake valves for Chevy Big Block engines.
Constructed from NK-844 material, offering high tensile strength at elevated temperatures.
Features chrome stems and hard tips for improved durability and longevity.
Swirl-polished under-head areas and fully machined combustion faces aid airflow and combustion efficiency.
Designed for high-temperature gasoline engine applications.
Each valve has a standard 3/8 inch stem diameter.

These valves are designed for Chevy Big Block engines. Please verify compatibility with your specific engine configuration before purchase.

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About this part

Product Details

Manley Performance is well-known for making strong engine components, especially for racing applications. These Severe Duty? intake valves are a prime example, built specifically for Chevy Big Block engines. They use NK-844 material, which Manley states has over four times the ultimate tensile strength of competing intake valve materials at 1000°F, making them a solid choice for high-temperature gasoline engines.

These valves are designed with chrome stems and hard tips for added durability, and the under-head areas are swirl-polished to help improve airflow into the combustion chamber. Manley also mentions that their valves, including these, have undergone rigorous fatigue testing, enduring up to 100 million cycles in some tests, which is significantly more than many competitors.

This set includes eight intake valves, each with a standard 3/8 inch stem, ready to be installed in your Big Block build. If you're working on a performance gasoline engine that runs hot, these valves are built to handle the stress.