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

The NK-844 material used for these intake valves displays over four times the ultimate tensile strength of competing materials at 1000°F. This makes them well-suited for high-temperature engine environments.

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

Swirl polishing the under head areas, along with fully machining the combustion faces, is done to help improve airflow into the cylinder. This can contribute to better combustion efficiency.

Are these valves sold individually or as a set?

These Manley Pro Flo valves are sold as a set of 8, which is the standard quantity needed for a V8 engine's intake valves.

Specifications

Brand: Manley Performance
Part #: 11686-8
UPC: 807298051130

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

Name: Manley Chevy LS-3/L-99 Small Block 2.165 Pro Flo Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-ls-3-l-99-small-block-2-165-pro-flo-intake-valve-t14-281112
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 LS-3/L-99 Small Block 2.165 Pro Flo Intake Valves (Set of 8). Made with NK-844 material for improved strength at high temperatures.

Key Features

These are Manley Pro Flo intake valves for Chevy LS-3/L-99 small block engines.
Constructed from NK-844 material, offering superior tensile strength at high temperatures.
Head diameter is 2.165 inches, stem diameter is 0.3133 inches, and overall length is 4.900 inches.
Features chrome stems and hard tips for enhanced durability and a longer service life.
Swirl polished under head areas and fully machined combustion faces help improve airflow.
Severe Duty valves have demonstrated over 100 million cycles in fatigue testing.

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About this part

Product Details

These Manley Pro Flo intake valves are made from NK-844 material, which offers over four times the ultimate tensile strength of competing intake valve materials at 1000°F. This makes them a strong choice for high-temperature gasoline engines, especially those in Chevy LS-3 and L-99 applications. The valves measure 2.165 inches in head diameter, 0.3133 inches in stem diameter, and have an overall length of 4.900 inches.

Manley's Severe Duty valves are built for demanding conditions. They've undergone rigorous fatigue testing, enduring up to 100 million cycles in tests where competitors' valves failed after only 100,000 cycles. This exceptional durability is thanks to features like chrome stems and hard tips, which add to their longevity. The under-head areas are swirl-polished, and the combustion faces are fully machined to help improve airflow and combustion efficiency.