What material are these Manley valves made from?

These Manley Race Series intake valves are constructed from a high-quality NK-842 stainless steel alloy. This material is chosen for its durability and ability to withstand the demands of high-RPM engine operation.

What is the purpose of the swirl polished under-head area?

The swirl polished under-head area helps to smooth the flow of air into the cylinder. This can lead to improved combustion efficiency and better overall engine performance.

Are these valves suitable for alcohol-fueled engines?

While the description specifically recommends these valves for exhaust in alcohol engines, their robust stainless steel construction and wear-resistant features make them a strong choice for performance builds, including those using alcohol fuels.

Specifications

Brand: Manley Performance
Part #: 11518-8
UPC: 807298049403

Manley 426 HEMI 2.250 Intake .310inch Stem 5.490inch Length Stainless Intake Valves (Set of 8)

Name: Manley 426 HEMI 2.250 Intake .310inch Stem 5.490inch Length Stainless Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-426-hemi-2-250-intake-310inch-stem-5-490inch-length-st-t14-4314106
Price: 235.06 USD
Availability: BackOrder

$235.06

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Manley 426 HEMI intake valves, 2.250" head, .310" stem, 5.490" length. Set of 8. Built for high-RPM performance.

Key Features

Fits 426 HEMI engines.
Set includes 8 intake valves.
Constructed from durable NK-842 stainless steel.
Features chrome stems and hard tips for improved wear resistance.
Swirl polished under-head areas and fully machined combustion faces optimize airflow.
Designed for engines operating up to 8000 RPM.

⚠️ 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 Race Series intake valves are made from a strong stainless steel, specifically the NK-842 alloy, which is built to handle the stress of engines running up to 8000 RPM. They feature a 2.250-inch head diameter and a 5.490-inch overall length, with a .310-inch stem diameter, making them a direct fit for many 426 HEMI applications needing improved airflow.

You'll notice the chrome stems and hard tips, which are there to help them last longer and resist wear, especially in demanding racing conditions. The under-head area is swirl polished to help smooth out airflow, and the combustion face is fully machined. This attention to detail helps optimize how air and fuel mix and burn, which is crucial for getting the most out of your engine, whether you're on the drag strip or the oval track.

This set includes eight intake valves, enough for a full engine build. While designed for racing, their well-built construction and material choices make them a solid option for any performance-oriented 426 HEMI build where reliability and airflow are key.