What material are these intake valves made from?

These Manley intake valves are constructed from NK-844 material. This material is chosen for its high tensile strength, especially at elevated temperatures like 1000°F, making them suitable for demanding engine conditions.

What does 'Severe Duty' mean for these valves?

The 'Severe Duty' designation means these valves have undergone extensive fatigue testing and are built with materials and features designed to withstand higher stresses and temperatures than standard valves. They've shown impressive durability in tests, enduring many more cycles than competing valves.

Are these valves a direct replacement for stock LT-1 6.2L intake valves?

These valves are designed for the Chevy LT-1 6.2L engine and feature a 2.120 inch head diameter. While they are intended as a performance upgrade, it's always recommended to consult with a professional or refer to your engine's specific service manual to ensure compatibility with your build.

Specifications

Brand: Manley Performance
Part #: 12352-8
UPC: 807298086071

Manley Chevy LT-1 6.2L 2.120in Head Diameter Pro Flo/Severe Duty Intake Valves (Set of 8)

Name: Manley Chevy LT-1 6.2L 2.120in Head Diameter Pro Flo/Severe Duty Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-lt-1-6-2l-2-120in-head-diameter-pro-flo-severe-d-t14-120066
Price: 361.47 USD
Availability: BackOrder

$361.47

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Manley Chevy LT-1 6.2L 2.120in Head Diameter Pro Flo/Severe Duty Intake Valves (Set of 8). Built for high-temp gasoline engines.

Key Features

Fits Chevy LT-1 6.2L engines.
Set includes 8 intake valves.
2.120 inch head diameter.
Made from NK-844 material for high tensile strength at elevated temperatures.
Features chrome stems and hard tips for improved durability.
Swirl polished under head areas and fully machined combustion faces aid airflow.

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About this part

Product Details

If you're rebuilding the top end of your Chevy LT-1 6.2L engine and need intake valves that can handle serious stress, these Manley Severe Duty valves are a solid option. They're specifically made for high-temperature gasoline engines, meaning they're built to last under demanding conditions.

Manley uses NK-844 material for these intake valves, which they say has over four times the ultimate tensile strength of other leading intake valve materials at 1000°F. The valves also feature chrome stems and hard tips for added durability, and the under-head areas are swirl-polished while the combustion faces are fully machined. This design helps improve airflow into the combustion chamber.

These valves have been put through rigorous fatigue testing, enduring up to 100 million cycles in some tests, which is significantly more than many competitor valves. This level of testing and material strength means they're well-suited for engines that see a lot of use or operate at higher temperatures.