What makes these valves 'Extreme Duty'?

These valves are built with XH-432 XtremeAlloy material, which is chosen for its exceptional resistance to extreme force and heat. They also feature chrome stems and hard tips to ensure they last longer under demanding conditions.

What kind of applications are these valves best suited for?

They are ideal for specialized, high-stress applications such as Top Fuel and Funny Car drag racing, marine engines, and circle track racing where heat and force resistance are critical.

Does this set include everything needed for an engine?

This is a set of 8 exhaust valves, which is the correct quantity for a standard Small Block Chevy engine. You would typically need a separate set of intake valves.

Specifications

Brand: Manley Performance
Part #: 11687-8
UPC: 807298051147

Manley Chevy LS-7 Small Block 1.610in Dia Extreme Duty Exhaust Valves (Set of 8)

Name: Manley Chevy LS-7 Small Block 1.610in Dia Extreme Duty Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-ls-7-small-block-1-610in-dia-extreme-duty-exhaus-t14-4364235
Price: 596.61 USD
Availability: BackOrder

$596.61

On Backorder

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Manley Performance Extreme Duty exhaust valves for Chevy LS-7 Small Block engines. Built for extreme heat and force.

Key Features

Set of 8 Manley Extreme Duty exhaust valves for Chevy LS-7 Small Block engines.
Constructed from XH-432 XtremeAlloy, a material designed for extreme force and heat resistance.
Features chrome stems and hard tips for enhanced longevity and wear resistance.
Swirl polished under head areas and fully machined combustion faces improve airflow and combustion efficiency.
Ideal for specialized applications like Top Fuel, Funny Car, and marine engines.

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About this part

Product Details

Manley Performance has a long history of making strong engine components for racing and high-performance applications. These Extreme Duty Series exhaust valves are a prime example, built to handle the intense conditions found in Top Fuel drag racing, marine engines, and competitive circle track racing where every bit of performance and durability counts. If your Small Block Chevy LS-7 is seeing extreme use, these valves are designed to keep up.

The key to their toughness is the XH-432 XtremeAlloy material, which is specifically chosen for its ability to resist extreme force and heat. You'll also find chrome stems and hard tips, features that significantly boost their longevity and resistance to wear, even under constant stress. Beyond just durability, these valves are optimized for performance. The under-head areas are swirl polished to help smooth airflow, and the combustion faces are fully machined. This attention to detail helps improve how efficiently air and fuel move into the cylinder and how well combustion happens, which can make a noticeable difference in how your engine runs.

This set includes eight exhaust valves, enough for a complete Small Block Chevy engine. They are a solid option when you need components that can withstand the rigors of demanding engine builds and specialized racing environments.