What specific applications are these valves best suited for?

These valves are ideal for specialized, high-stress applications. They are designed for Top Fuel and Funny Car drag racers, high-performance marine engines, and restricted carburetor circle track competitors where extreme force and heat resistance are critical.

What makes the XH-432 XtremeAlloy material special?

XH-432 XtremeAlloy is Manley's hallmark material for exhaust valves, specifically chosen for its exceptional ability to withstand extreme heat and force. This makes it suitable for the most demanding engine builds.

Are these valves sold individually or as a set?

This product is sold as a set of eight valves, which is the standard quantity needed for most Small Block Chevrolet engines.

Specifications

Brand: Manley Performance
Part #: 11709-8
UPC: 807298056357

Manley Small Block Chevrolet 1.600 Diameter .300 Longer Extreme Duty Exhaust Valves - Set of 8

Name: Manley Small Block Chevrolet 1.600 Diameter .300 Longer Extreme Duty Exhaust Valves - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-small-block-chevrolet-1-600-diameter-300-longer-extrem-t14-146482
Price: 596.61 USD
Availability: BackOrder

$596.61

On Backorder

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

Manley Small Block Chevrolet 1.600 Diameter .300 Longer Extreme Duty Exhaust Valves - Set of 8. Built for extreme heat and force.

Key Features

This set includes eight Manley Performance Extreme Duty exhaust valves.
Each valve has a 1.600 inch diameter and is .300 inches longer than standard.
Constructed from Manley's XH-432 XtremeAlloy material for extreme heat and force resistance.
Features chrome stems and hard tips for enhanced durability and wear resistance.
Swirl polished under head areas and fully machined combustion faces improve airflow and combustion efficiency.

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About this part

Product Details

In this set, you get eight Manley Performance Extreme Duty exhaust valves, each measuring 1.600 inches in diameter and extending .300 inches longer than stock. These valves are specifically crafted for high-stress environments, making them a solid choice for applications like Top Fuel and Funny Car drag racing, high-performance marine engines, and competitive circle track racing where engines run under extreme force and heat.

The core of these valves is Manley's XH-432 XtremeAlloy material, chosen for its exceptional heat and force resistance. To ensure they stand up to the rigors of demanding use, they feature chrome stems and hard tips, which significantly boosts their longevity and resistance to wear. The under-head areas are swirl polished to help improve airflow, and the combustion faces are fully machined to optimize combustion efficiency, contributing to better overall engine performance.

If you're building a Small Block Chevrolet engine that needs to handle serious punishment and deliver consistent performance under extreme conditions, these valves are a well-built option. They are designed to be a direct replacement for standard exhaust valves, but their advanced materials and construction make them suitable for specialized, high-output builds where reliability is paramount.