What makes the NK-844 material special for intake valves?

The NK-844 material used for these intake valves offers exceptional tensile strength at high temperatures. Manley reports it has over four times the ultimate tensile strength of the competition's best intake valve material at 1000°F, contributing to improved durability.

What kind of testing have these valves undergone?

These Severe Duty valves have undergone rigorous fatigue testing. They were tested at 40,000 psi and 1400°F, enduring up to 100 million cycles, which is significantly more than many competitor valves that failed much sooner.

Are any other parts included with this valve?

This listing is for a single intake valve. Other engine components, such as exhaust valves, seals, or retainers, are sold separately.

Specifications

Brand: Manley Performance
Part #: 11530-1

Manley Severe Duty Series Chevy Big Block Intake Valve 2 300 In Head Dia 5 325 In O/A Length

Name: Manley Severe Duty Series Chevy Big Block Intake Valve 2 300 In Head Dia 5 325 In O/A Length
Brand: Manley Performance
SKU: manley-performance-manley-severe-duty-series-chevy-big-block-intake-valve-2-300--t14-832733
Price: 45.18 USD
Availability: BackOrder

$45.18

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Manley Severe Duty Series Chevy Big Block Intake Valve. Features NK-844 material for improved durability in high-temperature engines.

Key Features

Fits Chevy Big Block engines.
Intake valve made from NK-844 material, offering over four times the ultimate tensile strength of competing materials at 1000°F.
Features a 2.300-inch head diameter and a 5.325-inch overall length.
Chrome stems and hard tips enhance durability and longevity.
Swirl polished under head areas and fully machined combustion faces improve airflow and combustion efficiency.
Designed for high-temperature gasoline engines.

⚠️ 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

Starting with the NK-844 material for intake valves, Manley Performance has developed a Severe Duty Series valve that's built to handle the stresses of high-temperature gasoline engines. These valves are designed for Chevy Big Block applications, featuring a 2.300-inch head diameter and a 5.325-inch overall length.

Beyond the advanced material, these valves incorporate chrome stems and hard tips, which add to their overall durability and longevity. The under-head areas are swirl polished, and the combustion faces are fully machined. This design work helps to optimize airflow and improve combustion efficiency within the engine. Manley's testing shows these valves can endure up to 100 million cycles at high temperatures and stress levels, significantly outlasting many competitors.