What material is this intake valve made from?

This Manley intake valve is made from NK-844 material. This material is chosen for its high tensile strength, especially in high-temperature gasoline engine environments.

What makes these valves 'Severe Duty'?

The 'Severe Duty' designation comes from rigorous fatigue testing. These valves endured up to 100 million cycles in tests where competitors failed much sooner, indicating they are built for high-stress conditions.

Does this valve come individually or as a set?

The product listing is for a single intake valve. You will need to order the correct quantity to match the number of intake valves required for your specific Chevrolet Big Block engine.

Specifications

Brand: Manley Performance
Part #: 12854-1
UPC: 807298005812

Manley Chevrolet Big Block 2.300 Head Dia .5.494in Stem Severe Duty Intake Valve - Single

Name: Manley Chevrolet Big Block 2.300 Head Dia .5.494in Stem Severe Duty Intake Valve - Single
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-big-block-2-300-head-dia-5-494in-stem-severe-t14-718265
Price: 45.18 USD
Availability: BackOrder

$45.18

On Backorder

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

Manley Severe Duty intake valve for Chevrolet Big Block engines. Made with NK-844 material for high-temperature gasoline engines.

Key Features

Fits Chevrolet Big Block engines.
Intake valve with a 2.300-inch head diameter and a .5.494-inch stem.
Constructed from NK-844 material, known for its high tensile strength in high-temperature gasoline engines.
Features chrome stems and hard tips for improved durability and longevity.
Swirl polished under head areas and fully machined combustion faces help optimize airflow and combustion efficiency.
Underwent rigorous fatigue testing, showing exceptional endurance compared to competitor valves.

⚠️ 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

When you're rebuilding a Chevrolet Big Block engine, especially for demanding applications, the right valve makes a big difference. This is a Manley Severe Duty intake valve, designed to handle the heat and stress of high-performance gasoline engines. It features a 2.300-inch head diameter and a .5.494-inch stem, built to be a strong replacement for your engine's intake side.

Manley uses their NK-844 material for these intake valves, which has a very high tensile strength at elevated temperatures compared to other common intake valve materials. The stems are chromed, and the tips are hardened, adding to their durability and resistance to wear. The under-head area is swirl polished to help with airflow into the combustion chamber, and the combustion face is fully machined for better efficiency.

These valves have been put through some serious testing. In fatigue tests simulating extreme conditions, they held up for millions of cycles where other valves failed much sooner. This level of testing means they're built to last under tough operating conditions.