What material are these intake valves made from?

These Manley intake valves are made from NK-844 material. This material is chosen for its superior tensile strength at high temperatures, making it well-suited for demanding gasoline engines.

What is the benefit of a hollow stem valve?

A hollow stem valve is lighter than a solid stem valve of the same size. This reduced weight helps the valvetrain respond more quickly and can improve overall engine performance, especially at higher RPMs.

Are these valves suitable for racing applications?

Yes, these valves are part of Manley's Severe Duty line and have undergone rigorous fatigue testing, enduring up to 100 million cycles under high stress. Their advanced materials and construction are designed for high-performance and racing conditions.

Specifications

Brand: Manley Performance
Part #: 11686H-8
UPC: 807298042893

Manley Chevy LS-3/L-99 Small Block (L-92 Head) 2.165 Pro Flo Hollow Stem Intake Valves (Set of 8)

Name: Manley Chevy LS-3/L-99 Small Block (L-92 Head) 2.165 Pro Flo Hollow Stem Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-ls-3-l-99-small-block-l-92-head-2-165-pro-flo-ho-t14-4332886
Price: 805.63 USD
Availability: BackOrder

$805.63

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Manley Chevy LS-3/L-99 Small Block (L-92 Head) 2.165 Pro Flo Hollow Stem Intake Valves (Set of 8). These intake valves offer improved strength and durability for high-performance engines.

Key Features

Fits Chevy LS-3/L-99 Small Block engines with L-92 heads.
Set includes eight (8) Pro Flo Hollow Stem Intake Valves.
Features a 2.165 inch head diameter and 4.900 inch overall length.
Hollow stem design reduces weight for improved valvetrain dynamics.
Constructed from NK-844 material for exceptional high-temperature strength.
Chrome stems and hard tips enhance durability and wear resistance.

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About this part

Product Details

This set includes eight Manley Pro Flo Hollow Stem Intake Valves, specifically designed for Chevy LS-3/L-99 engines with L-92 heads. These valves are a critical component for ensuring your engine breathes efficiently, especially in high-performance applications where stock parts might not hold up. They feature a 2.165-inch head diameter and a hollow stem design, which helps reduce overall weight for improved valvetrain response.

Manley has engineered these valves using their NK-844 material, which offers significantly higher tensile strength at elevated temperatures compared to many common intake valve materials. This means they can withstand the intense heat and stress inside a performance gasoline engine without deforming. The stems are chrome-plated for added wear resistance, and the tips are hardened to handle the forces from the valvetrain. The under-head areas are swirl-polished to help direct airflow smoothly into the combustion chamber, and the valve faces are fully machined for optimal sealing and combustion efficiency.

These valves have undergone extensive fatigue testing, demonstrating an impressive ability to endure millions of cycles under high stress, far exceeding the performance of many competitor valves. This robust construction and advanced material science translate to a more reliable and consistent performance from your engine, especially when pushed hard. If you're rebuilding or upgrading your LS-3 or L-99 engine, these intake valves are a solid choice for enhancing durability and performance.