What material are these exhaust valves made from?

These Manley Race Flo exhaust valves are constructed from XH-426 stainless steel, a material chosen for its durability and resistance to high temperatures. They also feature chrome stems and hard tips for added wear resistance.

Are these valves suitable for street use or only racing?

Manley designs these Race Series valves for the rigorous demands of bracket, drag, and oval track racing, especially for engines operating under 8000 RPM. While they are built for performance, their durable construction can also be beneficial in high-performance street applications.

What is the significance of the 'Race Flo' shape and the dish design?

The Race Flo shape is a specific design intended for certain racing engine configurations. The 5-degree dish on the valve face is designed to work with specific piston dish shapes to achieve the desired combustion chamber volume and efficiency for your build.

Specifications

Brand: Manley Performance
Part #: 11889-8
UPC: 807298054858

Manley Ford 289 - 302 - 351W 1.600 Head Dia 5.080 OA L 5 Deg Dish Race Flo Exhaust Valves (Set of 8)

Name: Manley Ford 289 - 302 - 351W 1.600 Head Dia 5.080 OA L 5 Deg Dish Race Flo Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-ford-289-302-351w-1-600-head-dia-5-080-oa-l-5-deg-dish-t14-4330351
Price: 218.97 USD
Availability: BackOrder

$218.97

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Manley Ford 289 - 302 - 351W 1.600 Head Dia 5.080 OA L 5 Deg Dish Race Flo Exhaust Valves (Set of 8). Built for high-RPM racing engines.

Key Features

Fits Ford 289, 302, and 351W engines.
Set includes 8 exhaust valves.
Constructed from durable XH-426 stainless steel.
Features chrome stems and hard tips for improved wear resistance.
Swirl polished under-head areas and fully machined combustion faces optimize airflow.
Race Flo shape is suitable for specific racing engine builds.

These valves are designed for Ford 289, 302, and 351W engines. Please verify compatibility with your specific engine build.

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About this part

Product Details

Manley Performance is well-known for making strong internal engine components for racing applications. These Race Flo exhaust valves are a prime example, built specifically for Ford 289, 302, and 351W engines that see serious use, especially those operating under 8000 RPM. If you're rebuilding the top end of a performance Ford V8, these valves are designed to handle the stress.

These exhaust valves are made from XH-426 stainless steel, which is a solid choice for durability and resisting heat. They also feature chrome-plated stems and hardened tips to reduce wear in the valve guides and seats over time. The under-head area is swirl polished to help smooth airflow into the cylinder, and the combustion face is fully machined for better efficiency. The Race Flo shape is a specific design choice for certain racing engine builds, and Manley recommends these for alcohol-fueled engines where they offer reliable performance.

This set includes eight exhaust valves, each with a 1.600-inch head diameter and a 5.080-inch overall length. They are a dish-style valve, designed to work with specific piston dish shapes for optimal combustion chamber volume. Remember to check your piston and cylinder head combination to ensure these valves will work correctly in your build.