What material are these exhaust valves made from?

These Manley Race Series exhaust valves are constructed from high-quality stainless steel. This material is chosen for its durability and resistance to heat and wear in demanding engine applications.

Are these valves suitable for all engine RPM ranges?

These valves are specifically recommended for engines operating under 8000 RPM. For higher RPM applications, different valve series might be more appropriate.

What is the benefit of swirl polishing and machining the valves?

The swirl polished under-head areas and fully machined combustion faces are designed to optimize airflow. This helps improve the efficiency of air entering the cylinder and exhaust gases exiting, contributing to better combustion performance.

Manley Chevrolet Big Block Exhaust Valves Kit 12341-8

Name: Manley Chevrolet Big Block Exhaust Valve Kit - 1.800in Head Dia. 5.930in O/A Length, 0.3415in Stem
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-big-block-exhaust-valve-kit-1-800in-head-dia-t14-879410
Price: 218.97 USD
Availability: BackOrder

Manley Chevrolet Big Block Exhaust Valve Kit - 1.800in Head Dia. 5.930in 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 Chevrolet Big Block exhaust valve kit. Stainless steel construction for durability in high-RPM engines.

Key Features

Fits Chevrolet Big Block engines.
Constructed from high-quality stainless steel for durability.
Chrome stems and hard tips enhance longevity and wear resistance.
Swirl polished under-head areas and fully machined combustion faces optimize airflow.
Recommended for exhaust valves in alcohol engines.
Suitable for engines 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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Product Details

If you're rebuilding the top end of a Chevrolet Big Block engine, especially one that sees serious track time or operates above 8000 RPM, these Manley Race Series exhaust valves are a solid option. They are built from high-quality stainless steel, which is crucial for handling the heat and stress inside the combustion chamber. The stems are chromed and feature hard tips, adding to their wear resistance and overall lifespan, which is important for keeping your engine running strong.

Manley puts a lot of attention into optimizing airflow with these valves. The under-head areas are swirl polished, and the combustion faces are fully machined. This helps the air-fuel mixture move more efficiently into the cylinder and exhaust gases out, contributing to better combustion. They're also recommended for use in alcohol-fueled engines, which tend to run cooler but can be corrosive, so the stainless steel construction is a real benefit there. You can choose between Race Master (straight stem) and Race Flo shapes to best match your engine's specific airflow needs.