What makes these valves 'Extreme Duty'?

These valves are built with Manley's XH-432 XtremeAlloy material, which is specifically chosen for its ability to withstand the extreme heat and forces found in racing applications like Top Fuel and marine engines.

What is the benefit of the chrome stems and hard tips?

The chrome-plated stems offer improved resistance to wear, helping to ensure a longer service life for the valve. The hard tips are designed to handle the impact and stress from aggressive valvetrain components.

Are these valves suitable for a standard street engine rebuild?

While these valves are exceptionally durable, they are specifically engineered for specialized, high-stress applications. For a standard street rebuild, you might consider a different valve series unless your build demands this level of extreme performance and heat resistance.

Specifications

Brand: Manley Performance
Part #: 11507-8
UPC: 807298049182

Manley Big Block Chevrolet 1.900 Diameter Stock Length Extreme Duty Exhaust Valves - Set of 8

Name: Manley Big Block Chevrolet 1.900 Diameter Stock Length Extreme Duty Exhaust Valves - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-big-block-chevrolet-1-900-diameter-stock-length-extrem-t14-513736
Price: 568.19 USD
Availability: BackOrder

$568.19

On Backorder

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

Manley Big Block Chevrolet 1.900" Diameter Stock Length Extreme Duty Exhaust Valves - Set of 8. Built for extreme heat and force in high-performance applications.

Key Features

Set of 8 Manley Extreme Duty exhaust valves for Big Block Chevrolet engines.
1.900 inch diameter and stock length for direct fitment in compatible cylinder heads.
Constructed from XH-432 XtremeAlloy, a material designed for extreme heat and force applications.
Features chrome-plated stems for improved wear resistance and longevity.
Hardened tips help withstand the rigors of high-performance valvetrain operation.
Swirl polished underhead areas are included to promote better airflow.

⚠️ 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 building a Big Block Chevrolet engine for serious competition, like Top Fuel, Funny Car, or high-performance marine use, you need parts that can handle extreme conditions. These Manley Extreme Duty exhaust valves are designed specifically for those demanding scenarios where heat and stress are at their absolute limit.

The core of these valves is Manley's XH-432 XtremeAlloy, a material chosen for its exceptional resistance to the intense heat generated in racing engines. They're built to last with chrome-plated stems that resist wear and hard tips to stand up to aggressive valvetrain action. You'll also find swirl-polished underhead areas, which help improve airflow into the cylinder, and fully machined combustion faces to ensure efficient combustion. These are stock length, so they'll fit into your existing Big Block Chevy cylinder heads without modification.

This set includes eight exhaust valves, enough for a complete V8 engine. When you're pushing your engine to its limits, using components like these Extreme Duty valves is crucial for reliability and performance.