What makes these valves 'Severe Duty'?

The 'Severe Duty' designation comes from the special NK-844 material used for intake valves, which offers much higher tensile strength at high temperatures. They've also undergone rigorous fatigue testing to ensure they can withstand extreme stress and millions of cycles.

What is the benefit of swirl-polished under-head areas and machined faces?

These features are designed to improve airflow into the combustion chamber. The swirl polishing helps create a smoother path for the air-fuel mixture, while the machined faces ensure a clean seal and efficient combustion.

Are these valves suitable for a stock engine rebuild?

While these valves are built for demanding conditions, they can certainly be used in a stock Small Block Chevy rebuild if you're looking for improved durability and longevity. They offer a well-built upgrade over standard components.

Specifications

Brand: Manley Performance
Part #: 11596-8
UPC: 807298050935

Manley SBC 2.02 Severe Duty Intake Valves (Set of 8)

Name: Manley SBC 2.02 Severe Duty Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-sbc-2-02-severe-duty-intake-valves-set-of-8-t14-4356212
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley SBC 2.02" Severe Duty Intake Valves (Set of 8). Built for high-temperature gasoline engines.

Key Features

Set of 8 Manley SBC 2.02" Severe Duty intake valves.
Constructed from NK-844 material, offering significantly improved tensile strength at high temperatures.
Designed for high-temperature gasoline engines, handling demanding operating conditions.
Features swirl-polished under-head areas and fully machined combustion faces for optimized airflow.
Chrome stems and hard tips enhance overall durability and service life.
Proven fatigue resistance, enduring significantly more cycles than competitor valves under stress.

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About this part

Product Details

If you're rebuilding the top end of a Small Block Chevy engine, especially one that sees hard use or high temperatures, these Manley Severe Duty intake valves are a solid choice. They're designed to handle the extra stress and heat that come with performance applications, ensuring reliable operation when you need it most.

Manley uses a special NK-844 material for these intake valves, which has a much higher tensile strength at high temperatures compared to typical intake valve materials. This means they're less likely to bend or fail under extreme conditions. The valves also feature swirl-polished under-head areas and fully machined faces to help improve airflow into the combustion chamber, contributing to better engine performance. Plus, the chrome stems and hard tips add extra durability for a longer service life.

This set includes eight valves, enough for a standard V8 engine. They're a well-built component that can make a notable difference in the longevity and performance of a high-stress engine build.