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

The NK-844 material used for these intake valves has over four times the ultimate tensile strength of competing materials at 1000°F. This makes them exceptionally strong and durable for high-temperature engine applications.

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

These design features help to improve the flow of air and fuel mixture into the combustion chamber. The swirl polish aids in smoother airflow, while the machined faces ensure a precise sealing surface.

Are these valves sold individually or as a set?

This is a set of 8 Manley SBC Severe Duty intake valves, which is the standard quantity needed for most V8 Small Block Chevy engines.

Specifications

Brand: Manley Performance
Part #: 11544-8
UPC: 807298049984

Manley SBC 2.020 Severe Duty Intake Valves (Set of 8)

Name: Manley SBC 2.020 Severe Duty Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-sbc-2-020-severe-duty-intake-valves-set-of-8-t14-4364011
Price: 361.47 USD
Availability: BackOrder

$361.47

On Backorder

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

Manley SBC 2.020 Severe Duty Intake Valves (Set of 8). Made with NK-844 material for high-temp gasoline engines.

Key Features

Set of 8 Manley SBC Severe Duty intake valves with a 2.020-inch diameter.
Constructed from NK-844 material, offering superior tensile strength at high temperatures for gasoline engines.
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 optimize airflow and combustion efficiency.
Designed and tested for high-temperature gasoline engines, enduring up to 100 million cycles in fatigue tests.

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About this part

Product Details

These Manley SBC Severe Duty intake valves are made from NK-844 material, a choice that offers over four times the ultimate tensile strength of competing intake valve materials at 1000°F. This makes them a well-built option for high-temperature gasoline engines where durability under stress is critical. The 2.020-inch diameter is a common size for performance Small Block Chevy builds, and the swirl-polished under-head area along with fully machined combustion faces are designed to help improve airflow into the cylinder.

Beyond the material, these valves feature chrome stems and hard tips, adding to their overall longevity and resistance to wear. Manley has put these valves through rigorous fatigue testing, showing they can endure up to 100 million cycles under demanding conditions, which is a notable improvement over many other valves that might fail much sooner. If you're rebuilding or upgrading the top end of a performance Small Block Chevy, these valves are a solid option designed for serious use.