What material are these intake valves made from?

These Manley Severe Duty? intake valves are made from NK-844 material. Manley states this material offers superior tensile strength at high temperatures compared to many other common intake valve materials.

What does the .200 longer dimension mean for my engine?

The .200 inch longer dimension means the valve stem is extended. This can be useful in certain cylinder head builds to achieve proper valve lift with specific camshafts or to optimize flow characteristics.

Are these valves suitable for a street-driven car?

While designed for severe duty and high temperatures, these valves can be used in street applications, especially if the engine is built for performance or experiences high heat. They offer improved durability and fatigue life.

Specifications

Brand: Manley Performance
Part #: 11700-8

Manley Small Block Chevrolet 2.055 Diameter .200 Longer Severe Duty Intake Valves - Set of 8

Name: Manley Small Block Chevrolet 2.055 Diameter .200 Longer Severe Duty Intake Valves - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-small-block-chevrolet-2-055-diameter-200-longer-severe-t14-538922
Price: 346.20 USD
Availability: BackOrder

$346.20

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Manley Small Block Chevrolet 2.055" Diameter .200" Longer Severe Duty Intake Valves - Set of 8. Built for high-temp gasoline engines.

Key Features

Fits Small Block Chevrolet engines.
Intake valves are 2.055 inches in diameter and .200 inches longer than stock.
Constructed from NK-844 material for high tensile strength at elevated temperatures.
Features chrome stems and hard tips for improved durability and wear resistance.
Swirl polished under head areas and fully machined combustion faces help optimize airflow and combustion efficiency.
Designed for high-temperature gasoline engine applications.

These valves are designed for Small Block Chevrolet engines. Please verify compatibility with your specific cylinder head and engine build.

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About this part

Product Details

If you're rebuilding the top end of a Small Block Chevrolet engine, especially for demanding applications, these Manley Severe Duty? intake valves are a solid choice. They're designed to handle the stresses of high-temperature gasoline engines, offering improved durability over standard valves. The .200 inch longer design can be beneficial for certain cylinder head porting or camshaft profiles, allowing for better valve lift and flow dynamics.

Manley uses NK-844 material for these intake valves, which they state has significantly higher tensile strength at high temperatures compared to other common intake valve materials. They also feature chrome stems and hard tips to resist wear, and the under-head area is swirl polished to help improve airflow into the combustion chamber. The fully machined combustion faces ensure a consistent sealing surface.

This set includes eight intake valves, enough for a standard V8 engine. While these are built for severe duty, always refer to the manufacturer's installation instructions for proper fitment and any specific requirements for your cylinder heads.