What material are these exhaust valves made from?

These Manley Severe Duty exhaust valves are made from XH-428 material. This alloy is chosen for its exceptional tensile strength at high temperatures, outperforming many common exhaust valve materials.

How do these valves compare to others in terms of durability?

Manley's Severe Duty valves have undergone extensive fatigue testing and have endured up to 100 million cycles at 1400°F. This is a notable improvement over many competitor valves that can fail after significantly fewer cycles.

What is the purpose of the swirl-polished under-head areas?

The swirl-polished under-head areas, along with the fully machined combustion faces, are designed to improve airflow dynamics within the combustion chamber. This can contribute to better combustion efficiency.

Specifications

Brand: Manley Performance
Part #: 11823-8
UPC: 807298053325

Manley Chevrolet 1.600 Dia Dish 5.026 O/A Length Severe Duty Exhaust Valves (Set of 8)

Name: Manley Chevrolet 1.600 Dia Dish 5.026 O/A Length Severe Duty Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-1-600-dia-dish-5-026-o-a-length-severe-duty--t14-4338628
Price: 349.40 USD
Availability: BackOrder

$349.40

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 1.600 Dia Dish 5.026 O/A Length Severe Duty Exhaust Valves (Set of 8). Built for high-temp gasoline engines with exceptional fatigue life.

Key Features

This product is a set of 8 Manley Severe Duty exhaust valves.
Each valve has a 1.600 inch diameter dish face and a 5.026 inch overall length.
Constructed from XH-428 material, offering superior tensile strength at high temperatures.
Designed for high-temperature gasoline engines, including Chevrolet applications.
Features chrome stems and hard tips for improved durability and longevity.
Swirl-polished under-head areas and fully machined combustion faces aid 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

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

This set includes eight Manley Severe Duty exhaust valves, each measuring 1.600 inches in diameter with an overall length of 5.026 inches. These valves are specifically crafted for Chevrolet engines, particularly those operating in high-temperature gasoline applications. They are made from XH-428 material, a specialized alloy that offers significantly higher tensile strength at elevated temperatures compared to common alternatives.

Manley's Severe Duty valves are built to withstand extreme conditions. They've undergone rigorous fatigue testing, enduring up to 100 million cycles under high stress and temperatures of 1400°F, which is a notable improvement over many competitor valves that fail much sooner. The design includes swirl-polished under-head areas and fully machined combustion faces to help optimize airflow and combustion efficiency. Additionally, they feature chrome stems and hard tips to enhance their durability and lifespan in demanding engine environments.