What material are these intake valves made from?

These Manley Performance intake valves are made from NK-844 material. This material is chosen for its high tensile strength, especially at elevated temperatures, making them suitable for demanding engine builds.

What are the key dimensions of these valves?

Each valve has a head diameter of 2.100 inches and a stem diameter of .3133 inches. The overall length is 4.874 inches.

Are these valves suitable for stock engines or performance builds?

These are considered 'Severe Duty' and 'Pro Flo' valves, indicating they are built for high-performance applications and high-temperature gasoline engines. They are designed to withstand stresses beyond those found in typical stock operation.

Specifications

Brand: Manley Performance
Part #: 11684-8
UPC: 807298056562

Manley Chevy LS-1/L-2 Small Block 2.100 Severe Duty/Pro Flo Intake Valves (Set of 8)

Name: Manley Chevy LS-1/L-2 Small Block 2.100 Severe Duty/Pro Flo Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-ls-1-l-2-small-block-2-100-severe-duty-pro-flo-i-t14-299521
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley Chevy LS-1/L-2 Small Block 2.100" Severe Duty Intake Valves (Set of 8). Built for high-temp gasoline engines.

Key Features

This product is a set of 8 Manley Performance Pro Flo intake valves.
Designed for Chevy LS-1 and L-2 small block engines.
Features a 2.100 inch head diameter and a .3133 inch stem diameter.
Constructed with NK-844 material for high tensile strength in high-temperature gasoline engines.
Includes chrome stems and hard tips for enhanced durability.
Swirl polished under head areas and fully machined combustion faces help improve airflow and combustion efficiency.

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About this part

Product Details

When you're rebuilding the top end of your Chevy LS-1 or L-2 small block engine, you're getting a set of eight Manley Performance Pro Flo intake valves. These aren't your average valves; they're built for serious duty, meaning they can handle the kind of stress that comes with high-performance gasoline engines. The goal here is to ensure your engine breathes efficiently, especially under demanding conditions.

Manley uses a special NK-844 material for these intake valves, which they say has significantly higher tensile strength at high temperatures compared to other common intake valve materials. This means they're less likely to bend or fail when your engine is running hot. They also feature chrome stems and hard tips for added durability, and the under-head area is swirl-polished to help improve airflow into the combustion chamber. With a 2.100-inch head diameter and a .3133-inch stem diameter, these are designed to fit specific LS-1 and L-2 applications.

These valves have been put through rigorous testing, showing impressive results in fatigue life compared to other valves on the market. This level of testing and material choice means you're getting a well-built component that's designed to last in high-temperature environments. Make sure to check the manufacturer's specifications for proper installation and compatibility with your specific cylinder heads.