What material are these intake valves made from?

These Manley Performance Pro Flo intake valves are made from NK-844 material. This material is specifically chosen for its high tensile strength, particularly at elevated temperatures common in high-performance gasoline engines.

What does 'Severe Duty' mean for these valves?

The 'Severe Duty' designation indicates these valves have undergone extensive fatigue testing and are built to withstand higher stress and temperatures than standard valves. Manley's testing shows they can endure significantly more cycles, making them suitable for demanding engine applications.

Are these valves sold individually or as a set?

This listing is for a single Manley LS7 2.205" Severe Duty Pro Flo Intake Valve. You will need to order the quantity required for your engine's cylinder heads.

Specifications

Brand: Manley Performance
Part #: 11688-1

Manley LS7 2.205 Severe Duty Pro Flo Intake Valve

Name: Manley LS7 2.205 Severe Duty Pro Flo Intake Valve
Brand: Manley Performance
SKU: manley-performance-manley-ls7-2-205-severe-duty-pro-flo-intake-valve-t14-539156
Price: 43.67 USD
Availability: BackOrder

$43.67

On Backorder

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

Manley LS7 2.205" Severe Duty Pro Flo Intake Valve. Built with NK-844 material for improved performance in high-temperature gasoline engines.

Key Features

Fits LS7 engines. This is a 2.205 inch intake valve.
Constructed from NK-844 material, chosen for its high tensile strength at elevated temperatures.
Designed for high-temperature gasoline engines.
Features swirl-polished under-head areas and fully machined combustion faces to improve airflow.
Chrome stems and hard tips enhance durability and longevity.
Underwent rigorous fatigue testing, demonstrating a notable resistance to cyclic stress.

⚠️ 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

If you're rebuilding the top end of a high-performance LS7 engine, especially one that sees demanding use, you need valves that can handle the heat and stress. These Manley Performance Pro Flo Intake Valves are built for that kind of work. They're made from NK-844, a material that Manley says has over four times the tensile strength of other leading intake valve materials at 1000°F, meaning they're designed to hold up under serious pressure and temperature.

Beyond the material, these valves feature swirl-polished under-head areas and fully machined combustion faces. This design helps improve airflow into the cylinder and can contribute to more efficient combustion. They also come with chrome stems and hard tips, which add to their durability and help them last longer in tough conditions. Manley has put these valves through rigorous fatigue testing, showing they can endure significantly more cycles than many competitors, which is crucial for engines that are pushed hard.