What material are these intake valves made from?

These Manley Severe Duty intake valves are made from NK-844 material. This material is known for its high tensile strength, especially at elevated temperatures, offering improved performance over common valve materials.

What kind of testing have these valves undergone?

Manley has subjected these valves to rigorous fatigue testing, with some units enduring up to 100 million cycles. This testing demonstrates their ability to withstand significant stress and prolonged use, far exceeding the lifespan of many competitor valves.

Are these valves suitable for stock or modified engines?

These valves are designed for high-temperature gasoline engines and are built for severe duty applications, making them a strong choice for both performance upgrades and robust engine rebuilds where durability and improved airflow are desired.

Specifications

Brand: Manley Performance
Part #: 11844-8
UPC: 807298053868

Manley Chevy Small Block 2.080 Head Dia. .100 Longer .3415 Stem Severe Duty Intake Valves (8 pcs)

Name: Manley Chevy Small Block 2.080 Head Dia. .100 Longer .3415 Stem Severe Duty Intake Valves (8 pcs)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-small-block-2-080-head-dia-100-longer-3415-stem--t14-4338407
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley Severe Duty Intake Valves for Chevy Small Block. 2.080" head dia., .100" longer, .3415" stem. Built for high-temp engines.

Key Features

This product includes 8 Manley Severe Duty intake valves.
Each valve has a 2.080-inch head diameter.
These valves are .100 inches longer than standard.
The stem diameter measures .3415 inches.
Constructed from NK-844 material for high tensile strength at elevated temperatures.
Features chrome stems and hard tips for improved durability.

These valves are designed for Chevy small block engines. Please consult manufacturer fitment data to confirm compatibility with your specific engine configuration.

⚠️ 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

You're getting a set of eight Manley Severe Duty intake valves, designed specifically for Chevy small block engines. These aren't your average valves; they're built with NK-844 material, which has over four times the tensile strength of common intake valve materials at high temperatures. The valves feature a 2.080-inch head diameter, are .100 inches longer than stock, and have a .3415-inch stem diameter, making them a solid choice for rebuilding or upgrading your engine's top end.

Manley has put these valves through some serious testing. They've endured up to 100 million cycles in fatigue tests, which is a staggering 1000 times longer than some competitor valves that failed after just 100,000 cycles. This kind of durability is crucial, especially when valves bounce on the seat, causing stress that can soar to 40,000 to 60,000 lbs. The swirl-polished under-head areas and fully machined combustion faces are there to help improve airflow into the cylinder, contributing to better combustion efficiency.

These valves are also built with chrome stems and hard tips for added wear resistance, and they're designed to perform well in high-temperature gasoline engines. If you're working on a performance build or a high-mileage engine that needs a robust valve upgrade, these Manley Severe Duty valves are a well-built option.