What material are these exhaust valves made from?

These Manley Race Series exhaust valves are made from XH-426 stainless steel. This material is chosen for its strength and ability to withstand high temperatures, making it suitable for demanding engine applications.

Are these valves suitable for high-RPM use?

Manley's Race Series valves are designed for engines operating under 8000 RPM. They are built to meet the rigorous demands of racing applications.

What is the benefit of the swirl-polished under-head area?

The swirl-polished under-head area helps to smooth the airflow as it enters the cylinder. This can contribute to improved combustion efficiency and performance.

Manley Pontiac 400 Exhaust Valve Kit 11337-8

Name: Manley Pontiac 400 Exhaust Valve Kit - 1.770in Head Dia. 5.230in O/A Length, 0.3415in Stem
Brand: Manley Performance
SKU: manley-performance-manley-pontiac-400-exhaust-valve-kit-1-770in-head-dia-5-230in-t14-880025
Price: 218.97 USD
Availability: BackOrder

Manley Pontiac 400 Exhaust Valve Kit - 1.770in Head Dia. 5.230in O/A Length, 0.3415in Stem

$218.97

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Pontiac 400 Exhaust Valve Kit - 1.770in Head Dia. 5.230in O/A Length, 0.3415in Stem. Stainless steel construction for durability.

Key Features

Fits Pontiac 400 engines.
Exhaust valves are constructed from XH-426 stainless steel for durability.
Chrome stems and hard tips enhance wear resistance.
Swirl polished under head areas and fully machined combustion faces optimize airflow.
Recommended for exhaust valves in alcohol engines.
1.770 inch head diameter.

⚠️ 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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Product Details

These Manley Race Series exhaust valves are built from XH-426 stainless steel, a material chosen for its strength and resistance to heat, making them a solid choice for Pontiac 400 engines that see a lot of use, especially those running alcohol fuels. The 1.770-inch head diameter and 5.230-inch overall length are specific dimensions to ensure they fit correctly within the cylinder head's valve guides and seat properly.

Beyond the robust stainless steel construction, these valves feature chrome-plated stems and hardened tips. This adds a layer of wear resistance right where the valve guides and rocker arms make contact, helping to extend the life of both the valve and the surrounding components. The under-head area is swirl polished to help smooth out airflow into the cylinder, and the combustion face is fully machined for better sealing and efficiency. If you're rebuilding a Pontiac 400 and need reliable exhaust valves that can handle demanding conditions, these are a well-built option.