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 ability to withstand the high temperatures and stresses found in performance engines.

Are these valves suitable for alcohol-fueled engines?

Yes, these valves are specifically recommended as exhaust valves for alcohol engines. Their robust construction and materials help ensure reliable performance even under demanding conditions.

What is the purpose of the swirl polished under head area?

The swirl polished under head area is designed to help optimize airflow into the cylinder. This feature, along with the fully machined combustion face, contributes to improved combustion efficiency.

Manley Exhaust Valve Kit 11311-8 - Chevrolet 409

Name: Manley Chevrolet 409 Exhaust Valve Kit - 1.735in Head Dia. 5.105in O/A Length, 0.3715in Stem
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-409-exhaust-valve-kit-1-735in-head-dia-5-105-t14-879770
Price: 218.97 USD
Availability: BackOrder

Manley Chevrolet 409 Exhaust Valve Kit - 1.735in Head Dia. 5.105in O/A Length, 0.3715in 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 409 exhaust valve kit. Stainless steel construction for durability and improved airflow.

Key Features

Fits Chevrolet 409 engines.
Exhaust valves are constructed from 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 and combustion efficiency.
Designed for engines operating under 8000 RPM.
Recommended for alcohol engines.

⚠️ 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 a Chevrolet 409 engine, these Manley Race Series exhaust valves are a solid option. They're built from stainless steel, which is key for handling the heat and stress inside the combustion chamber, especially if you're running alcohol fuel. The 1.735-inch head diameter and 5.105-inch overall length are specific dimensions for this application, ensuring they work with your existing setup.

Manley puts a lot of care into these valves. The stems are chromed for better wear resistance, and the under-head area is swirl polished to help improve airflow into the cylinder. The combustion face is also fully machined, which contributes to better combustion efficiency. These are designed for engines running up to 8000 RPM, so they're well-suited for performance builds like bracket, drag, or oval track racing.

This kit includes the exhaust valves. Remember to check the manufacturer's installation instructions for any specific requirements when installing these into your cylinder heads.