What material are these Manley valves made from?

These Manley Race Master intake valves are constructed from NK-842 stainless steel. This material is chosen for its durability and ability to withstand the high temperatures and stresses found in performance engines.

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

The swirl polished under head areas help to smooth the airflow as it enters the combustion chamber. This can lead to improved efficiency and better performance from your engine.

Are these valves suitable for all types of engines?

These valves are specifically designed for racing applications, particularly for engines operating under 8000 RPM. They are also recommended for exhaust valves in alcohol-fueled engines due to their robust construction.

Specifications

Brand: Manley Performance
Part #: 11656-4
UPC: 807298056661

Manley VW Rabbit Stainless 40.5mm Race Master Intake Valves (Set of 4)

Name: Manley VW Rabbit Stainless 40.5mm Race Master Intake Valves (Set of 4)
Brand: Manley Performance
SKU: manley-performance-manley-vw-rabbit-stainless-40-5mm-race-master-intake-valves-s-t14-4316028
Price: 109.49 USD
Availability: BackOrder

$109.49

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Manley Race Master 40.5mm stainless steel intake valves (Set of 4). Well-built for engines under 8000 RPM.

Key Features

Fits VW Rabbit.
Set includes four 40.5mm Race Master intake valves with straight stems.
Constructed from NK-842 stainless steel for durability.
Chrome stems and hard tips enhance longevity and wear resistance.
Swirl polished under head areas and fully machined combustion faces help optimize airflow and combustion efficiency.
Recommended for engines operating under 8000 RPM.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

These Manley Race Master intake valves are made from NK-842 stainless steel, a strong material chosen for its ability to handle the heat and stress inside your VW Rabbit's engine, especially when you're pushing it hard. They're designed for engines that see a lot of action, typically running up to 8000 RPM, making them a solid choice for bracket, drag, or oval track racing applications.

You'll notice the chrome stems and hard tips, which are there to help them last longer and resist wear, even with constant movement. The under-head areas are swirl polished to help smooth out airflow into the cylinders, and the combustion faces are fully machined. This attention to detail helps optimize how efficiently your engine breathes and burns fuel, which can make a noticeable difference when you're on the track.

This set includes four 40.5mm intake valves, featuring a straight stem design. If you're rebuilding the top end of your VW Rabbit and need reliable valves that can take a beating, these are a well-built option to consider.