What specific applications are these valves best suited for?

These Manley Extreme Duty valves are ideal for highly demanding applications like Top Fuel and Funny Car drag racing, as well as high-performance marine engines. They are built for any situation where extreme force and heat resistance is a primary concern.

What makes the XH-432 XtremeAlloy material special?

XH-432 XtremeAlloy is a specialized material chosen for its exceptional ability to withstand the intense temperatures and pressures found in extreme racing and high-output engine environments. It's a hallmark of Manley's high-performance valve construction.

Are any other valvetrain components recommended when using these valves?

Yes, because these valves are designed for extreme applications, it's crucial to ensure your valve springs and other valvetrain components are also rated for high-stress use. Matching these components will help ensure overall engine reliability and performance.

Specifications

Brand: Manley Performance
Part #: 11681-8
UPC: 807298051505

Manley Chevy LS-1/LS-2 4.923in Pro Flo/Extreme Duty Exhaust Valves (Set of 8)

Name: Manley Chevy LS-1/LS-2 4.923in Pro Flo/Extreme Duty Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-ls-1-ls-2-4-923in-pro-flo-extreme-duty-exhaust-v-t14-184565
Price: 596.61 USD
Availability: BackOrder

$596.61

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Manley Chevy LS-1/LS-2 4.923in Pro Flo/Extreme Duty Exhaust Valves (Set of 8). Built for extreme heat and force.

Key Features

This product includes a set of 8 Manley Performance Extreme Duty exhaust valves.
Constructed from XH-432 XtremeAlloy material, designed for extreme heat and force resistance.
Features chrome stems and hard tips for exceptional longevity and wear resistance.
Swirl polished under head areas improve airflow.
Fully machined combustion faces enhance combustion efficiency.
Overall length is 4.923 inches, head diameter is 1.575 inches, and stem diameter is .3136 inches.

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About this part

Product Details

This set includes eight Manley Performance Extreme Duty exhaust valves, designed for high-performance Chevy LS-1 and LS-2 engines. These valves are specifically crafted for applications that demand exceptional resistance to extreme force and heat, such as Top Fuel drag racing, Funny Car applications, and high-output marine engines. If you're building a race engine or a powerful marine powerplant where valve durability under severe conditions is critical, these are a solid choice.

The core of these valves is their XH-432 XtremeAlloy material, a well-known choice for its ability to withstand intense temperatures and pressures. They feature chrome stems and hard tips, which significantly boosts their longevity and resistance to wear, even in the harshest operating environments. To further optimize performance, the under-head areas are swirl polished to improve airflow, and the combustion faces are fully machined to enhance combustion efficiency. With an overall length of 4.923 inches, a head diameter of 1.575 inches, and a stem diameter of .3136 inches, these valves are built to handle the demands of specialized, high-stress engine builds.

When installing these valves, it's important to follow the manufacturer's recommended procedures to ensure proper seating and function. Because these are designed for extreme applications, ensuring your valve springs and other valvetrain components are also up to the task is crucial for overall engine reliability and performance.