What makes the NK-844 material special for intake valves?

The NK-844 material is a proprietary Manley alloy chosen for its exceptional strength at high temperatures. It displays over four times the ultimate tensile strength of competing intake valve materials at 1000°F, helping to prevent distortion and ensure reliability.

Why are these valves .100 inches longer than stock?

The .100-inch longer design is often used to optimize valve train geometry, especially when used with different camshafts or cylinder heads. This can help ensure proper valve lift and seating under various engine conditions.

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

Swirl polishing the area under the valve head helps to smooth airflow as it enters the combustion chamber. This can lead to improved volumetric efficiency and better overall combustion efficiency in the engine.

Specifications

Brand: Manley Performance
Part #: 11842-8
UPC: 807298053790

Manley Chevy Big Block .100 Longer 11/32in Stem Dia Extreme Duty & Marine Intake Valves (Set of 8)

Name: Manley Chevy Big Block .100 Longer 11/32in Stem Dia Extreme Duty & Marine Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-big-block-100-longer-11-32in-stem-dia-extreme-du-t14-4320804
Price: 349.40 USD
Availability: BackOrder

$349.40

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Chevy Big Block .100 Longer 11/32in Stem Dia Extreme Duty & Marine Intake Valves (Set of 8). Built with NK-844 material for high-temp gasoline engines.

Key Features

Set of 8 intake valves for Chevy Big Block engines.
Made from NK-844 material, offering superior tensile strength at high temperatures.
Valves are .100 inches longer than stock for improved valve train geometry.
Features an 11/32-inch stem diameter.
Designed for high-temperature gasoline engines and marine applications.
Swirl-polished under-head areas and machined combustion faces improve airflow.

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

These Manley intake valves are made from NK-844 material, which has over four times the ultimate tensile strength of competing intake valve materials at 1000°F. They are specifically designed to be .100 inches longer than stock and feature an 11/32-inch stem diameter, making them a solid choice for Chevy Big Block engines, especially those used in high-temperature gasoline applications or marine environments.

Manley's Severe Duty valves are built for demanding conditions. The NK-844 material used for these intake valves is chosen for its exceptional strength at high temperatures, helping to prevent valve distortion and failure. The valves also feature swirl-polished under-head areas and fully machined combustion faces, which help improve airflow into the cylinder for better combustion efficiency. Chrome stems and hard tips are included to further enhance durability and longevity, ensuring these valves can handle the stress of regular operation and even valve float scenarios.

This set includes eight intake valves, enough for a complete engine rebuild. They are a well-built option for anyone looking to replace or upgrade the valves in their Chevy Big Block engine, offering improved performance and reliability under demanding conditions.