What material is this exhaust valve made from?

This Manley Race Series exhaust valve is constructed from stainless steel, which offers good durability for high-performance engine applications. The stems are also chromed for enhanced wear resistance.

Are these valves suitable for all types of engines?

These Race Series valves are specifically recommended for racing engines, particularly those operating under 8000 RPM. The exhaust valves are also a recommended choice for alcohol engines due to their robust construction.

What is the benefit of swirl polishing and machining the valve face?

The swirl polished under head areas and fully machined combustion faces are designed to optimize airflow into and out of the combustion chamber. This can contribute to improved combustion efficiency and overall engine performance.

Specifications

Brand: Manley Performance
Part #: 11707-1
UPC: 807298001739

Manley Chevrolet Big Block 1.900in Head Dia. 5.422in O/A Length Race Series Exhaust Valve - Single

Name: Manley Chevrolet Big Block 1.900in Head Dia. 5.422in O/A Length Race Series Exhaust Valve - Single
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-big-block-1-900in-head-dia-5-422in-o-a-lengt-t14-752821
Price: 27.37 USD
Availability: BackOrder

$27.37

On Backorder

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

Manley Chevrolet Big Block Race Series exhaust valve. Stainless steel construction for durability.

Key Features

Fits Chevrolet Big Block engines.
Constructed from durable stainless steel for the exhaust valve.
Features chrome stems and hard tips for improved longevity and wear resistance.
Swirl polished under head areas and fully machined combustion faces help optimize airflow.
Recommended for alcohol engines as exhaust valves.
Designed for racing applications operating under 8000 RPM.

⚠️ 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

If you're rebuilding the top end of a Chevrolet Big Block engine, especially one that sees serious track time, these Manley Race Series exhaust valves are a solid option. They're built from stainless steel, which is a good choice for handling the heat and stress inside the combustion chamber. The exhaust valves, specifically, are recommended for alcohol-fueled engines, which run hotter and can be tougher on components.

Manley puts a lot of attention into the details with these valves. The stems are chromed for better wear resistance, and the tips are hardened to stand up to valve spring pressure over time. You'll also find the area under the head is swirl polished to help smooth out airflow, and the combustion face is fully machined. This all adds up to better breathing for your engine, which is key for performance, especially when you're running at higher RPMs, up to about 8000 RPM.

These are single valves, so you'll want to make sure you order the correct quantity for your engine build. They're designed for engines that are pushing the limits, so if you're aiming for serious performance on the drag strip, oval track, or just bracket racing, these are worth a look.