What material are these Manley intake valves made from?

These intake valves are constructed from stainless steel. They also feature chrome-plated stems and hardened tips for added durability and wear resistance.

What is the benefit of the swirl polished and machined faces?

The swirl polished under-head areas and fully machined combustion faces are designed to help optimize airflow into the cylinder. This can contribute to improved combustion efficiency in your engine.

Are these valves suitable for all types of engines?

Manley's Race Series valves are specifically designed for demanding racing applications, operating under 8000 RPM. They are also recommended for exhaust valves in alcohol engines.

Specifications

Brand: Manley Performance
Part #: 11650-4
UPC: 807298056708

Manley VW 1200-1600 Triple Groove 40.0mm Race Master Intake Valves (Set of 4)

Name: Manley VW 1200-1600 Triple Groove 40.0mm Race Master Intake Valves (Set of 4)
Brand: Manley Performance
SKU: manley-performance-manley-vw-1200-1600-triple-groove-40-0mm-race-master-intake-v-t14-4332520
Price: 109.49 USD
Availability: BackOrder

$109.49

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Manley VW 1200-1600 Triple Groove 40.0mm Race Master Intake Valves (Set of 4). These well-built stainless steel valves improve airflow.

Key Features

This product includes a set of four Manley Race Master intake valves.
Each valve measures 40.0mm and features a triple groove design.
Constructed from stainless steel for improved durability.
Chrome stems and hard tips are included for enhanced longevity and wear resistance.
The under-head areas are swirl polished and combustion faces are fully machined to optimize airflow.
These are straight stem valves, part of Manley's Race Master series.

⚠️ 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

In this set, you get four Manley Race Master intake valves, each measuring 40.0mm. These valves are built for engines that see a lot of action, like those in bracket, drag, and oval track racing, especially when they're running under 8000 RPM.

They're made from stainless steel, which is a solid choice for durability. The stems are chrome-plated and the tips are hardened, adding to their lifespan and resistance to wear. You'll also notice the under-head areas are swirl polished and the combustion faces are fully machined. This design helps optimize airflow into the cylinder and can contribute to better combustion efficiency.

Manley offers these in a Race Master straight stem design, which is what you're looking at here, and also a Race Flo shape. These are also recommended for use in alcohol-fueled engines, particularly for the exhaust side, where they can handle demanding conditions reliably.