What material are these Manley intake valves made from?

These Manley Race Series intake valves are constructed from stainless steel. This material is chosen for its durability and ability to withstand high temperatures common in performance engines.

What is the benefit of the swirl-polished and machined combustion face?

The swirl-polished under-head areas and fully machined combustion faces are designed to improve airflow into the cylinder. This can lead to more efficient combustion and potentially better engine performance.

Are these valves suitable for a stock engine rebuild?

While designed for racing, these valves are a well-built upgrade for performance-oriented street engines. If you are rebuilding the top end of your 4.6L or 5.4L V8 and looking for improved airflow and durability over stock, they are a solid option.

Specifications

Brand: Manley Performance
Part #: 11640-8
UPC: 807298015927

Manley 99-12 Ford V8 4.6L/281 5.4/330 45.5mm Race Series Stainless Steel Intake Valves (Set of 8)

Name: Manley 99-12 Ford V8 4.6L/281 5.4/330 45.5mm Race Series Stainless Steel Intake Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-99-12-ford-v8-4-6l-281-5-4-330-45-5mm-race-series-stai-t14-81943
Price: 235.06 USD
Availability: BackOrder

$235.06

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Fits 1999-2004 Ford Mustang. Manley Race Series stainless steel intake valves improve airflow for your V8.

Key Features

Fits 1999-2004 Ford Mustang and 1999-2000 Ford F-150.
Each intake valve measures 45.5mm in diameter and is constructed from durable stainless steel.
Chrome-plated stems and hardened tips offer improved wear resistance and longevity.
Swirl-polished under-head areas and fully machined combustion faces help optimize airflow.
Designed for engines operating under 8000 RPM, suitable for racing and high-performance street use.
Set includes eight intake valves for a complete V8 engine.

⚠️ 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 Series intake valves feature a 45.5mm diameter and are made from stainless steel, a strong material that holds up well under high temperatures. They're built for engines that see a lot of action, like those in bracket, drag, or oval track racing, and are a solid choice for street performance builds too, especially if you're rebuilding the top end of your 4.6L or 5.4L V8.

The stems are chrome-plated for better wear resistance, and the tips are hardened to handle the stress of valve operation. Manley also swirl polishes the area under the head and fully machines the combustion face. This helps smooth out airflow into the cylinder, which can make a noticeable difference in how efficiently your engine breathes and performs.

This set includes eight intake valves, enough for a complete V8 engine. While these are recommended for alcohol-fueled engines, they're a well-built option for gasoline applications looking for improved durability and airflow over stock components.