What material are these Manley intake valves made from?

These Manley intake valves are made from NK-844 material. This material is chosen for its high tensile strength, especially at elevated temperatures, contributing to improved durability.

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

The swirl-polished areas under the valve head are designed to improve airflow into the combustion chamber. This can lead to more efficient combustion and potentially better engine performance.

Are these valves sold individually or as a set?

This product is a set of 8 intake valves, which is the standard quantity needed for a V8 engine like the Chevy L83 5.3L.

Specifications

Brand: Manley Performance
Part #: 12358-8
UPC: 807298109930

Manley Chevy L83 5.3L 1.930in Head Diameter Pro Flo/Severe Duty Intake Valves (Set of 8)

Name: Manley Chevy L83 5.3L 1.930in Head Diameter Pro Flo/Severe Duty Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-l83-5-3l-1-930in-head-diameter-pro-flo-severe-du-t14-205652
Price: 361.47 USD
Availability: BackOrder

$361.47

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Manley L83 5.3L 1.930in Head Diameter Pro Flo/Severe Duty Intake Valves (Set of 8). Made with NK-844 material for improved durability.

Key Features

Fits Chevy L83 5.3L engines.
Intake valves made from NK-844 material for high tensile strength.
1.930-inch head diameter and .3133-inch stem.
Swirl polished under head areas and fully machined combustion faces improve airflow.
Chrome stems and hard tips enhance durability.
Designed for high-temperature gasoline engines.

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About this part

Product Details

Manley Performance is well-known for making strong engine components, and their Severe Duty? Valves are a prime example of that commitment. If you're working on a Chevy L83 5.3L engine, these intake valves are built to handle the demands of high-temperature gasoline operation. They feature a 1.930-inch head diameter and a .3133-inch stem, designed to fit right into your engine's cylinder heads.

These valves are crafted from NK-844 material, which Manley states has over four times the ultimate tensile strength of competing intake valve materials at 1000?F. The under-head areas are swirl polished, and the combustion faces are fully machined to help improve airflow and combustion efficiency. They also incorporate chrome stems and hard tips for added durability and a longer service life, even under the stress of repeated valve bouncing, which can reach up to 60,000 lbs of force.

This set includes eight intake valves, enough for a complete engine rebuild. They are designed for improved performance and longevity in demanding gasoline engine applications.