What makes these valves 'Extreme Duty'?

These valves are built with XH-432 XtremeAlloy, a material selected for its ability to withstand extreme forces and heat. They also feature chrome stems and hard tips for improved durability and wear resistance in demanding applications.

Are these valves suitable for a stock engine rebuild?

While these valves are built for extreme conditions like racing and marine applications, they can also be used in a stock 4.6L Ford engine rebuild if you are looking for improved longevity and heat resistance over standard components.

What is the benefit of swirl polished under head areas?

The swirl polishing on the under-head areas of the valves helps to smooth the airflow as it passes into the cylinder. This can contribute to improved combustion efficiency and overall engine performance.

Specifications

Brand: Manley Performance
Part #: 11633-8
UPC: 807298017877

Manley Ford 4.6L 38.5mm Race Master & Extreme Duty Exhaust Valves Set of 8

Name: Manley Ford 4.6L 38.5mm Race Master & Extreme Duty Exhaust Valves *Set of 8*
Brand: Manley Performance
SKU: manley-performance-manley-ford-4-6l-38-5mm-race-master-extreme-duty-exhaust-valv-t14-4316094
Price: 596.61 USD
Availability: BackOrder

$596.61

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Fits 2005-2008 Ford F-150. Manley Extreme Duty exhaust valves (set of 8) are built for extreme heat and force, improving airflow and longevity.

Key Features

Fits 2005-2008 Ford F-150, 2006-2008 Ford F-250 Super Duty, 2006-2008 Ford F-350 Super Duty, and 2005-2008 Ford Mustang.
Set of 8 exhaust valves, each measuring 38.5mm.
Constructed from XH-432 XtremeAlloy, a material known for extreme heat and force resistance.
Features chrome stems and hard tips for enhanced longevity and wear resistance.
Swirl polished under head areas and fully machined combustion faces help improve airflow and combustion efficiency.

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About this part

Product Details

Manley Performance is well-known for building robust engine components for high-performance racing applications. If you're working on a Ford 4.6L engine, especially for demanding uses, these Manley Extreme Duty exhaust valves are a solid choice. They are designed to handle extreme forces and heat, making them suitable for serious builds where reliability under pressure is key.

These valves are constructed with XH-432 XtremeAlloy, a material chosen for its exceptional heat resistance. They feature chrome stems and hard tips, which significantly increases their lifespan and resistance to wear, even in tough conditions. The under-head areas are swirl polished to help improve airflow, and the combustion faces are fully machined to promote better combustion efficiency. This attention to detail means you're getting a part that's not just strong, but also optimized for performance.

This set includes eight valves, specifically sized at 38.5mm for the exhaust port. They are designed to fit a range of Ford vehicles including the F-150, F-250 Super Duty, F-350 Super Duty, and Mustang from the mid-2000s. If your build demands components that can withstand extreme conditions and offer improved airflow, these Manley valves are a worthwhile consideration.