What makes these valves 'Severe Duty'?

The 'Severe Duty' designation comes from Manley's rigorous testing, showing these valves can withstand extreme stress and high temperatures for millions of cycles. They are built with advanced materials like NK-844 and feature enhanced durability components like chrome stems and hard tips.

Does this set include everything needed for installation?

This set includes eight intake valves. You will need to ensure you have the correct valve springs, retainers, seals, and other necessary components for your specific engine build, as these are sold separately.

Specifications

Brand: Manley Performance
Part #: 12338-8

Manley Small Block Chevy 2.100in Head Dia Severe Duty Intake Valves (Set of 8)

Name: Manley Small Block Chevy 2.100in Head Dia Severe Duty Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-small-block-chevy-2-100in-head-dia-severe-duty-intake--t14-808793
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 Performance Severe Duty Intake Valves for Small Block Chevy. Made from NK-844 material for improved durability in high-temp engines.

Key Features

Fits Small Block Chevy engines.
Intake valves are constructed from NK-844 material for exceptional high-temperature strength.
Features a 2.100-inch head diameter and a .3133-inch stem diameter.
Chrome stems and hard tips enhance durability and wear resistance.
Swirl polished under head areas and fully machined combustion faces improve airflow.
Designed for high-temperature gasoline engines.

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About this part

Product Details

These Manley 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. They're designed specifically for high-temperature gasoline engines, like those found in many Small Block Chevy applications. The 2.100-inch head diameter and the .3133-inch stem diameter are standard sizes for many performance builds, and the valves are built to handle the stresses of demanding operation.

Beyond the advanced material, these valves feature chrome stems and hard tips, which add to their overall durability and resistance to wear. The under-head areas are swirl polished, and the combustion faces are fully machined. This attention to detail helps improve airflow into the combustion chamber, contributing to better engine efficiency. Manley has put these valves through rigorous fatigue testing, showing they can endure up to 100 million cycles under extreme conditions, far outperforming many competitors.

This set includes eight intake valves, enough for a complete engine. If you're rebuilding or upgrading your Small Block Chevy's top end, these well-built valves are a solid option for improved performance and longevity.