What material are these exhaust valves made from?

These Manley Severe Duty exhaust valves are made from XH-428 material. This material is chosen for its exceptional strength at high temperatures, offering nearly double the tensile strength of competing materials at 1500°F.

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

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

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

Manley's Severe Duty valves have demonstrated impressive fatigue life in testing, enduring up to 100 million cycles under demanding conditions. This is significantly longer than many competitor offerings, which may fail after far fewer cycles.

Specifications

Brand: Manley Performance
Part #: 12361-8
UPC: 807298109978

Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo/Severe Duty Exhaust Valve (Set of 8)

Name: Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo/Severe Duty Exhaust Valve (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-l83-5-3l-1-560in-head-diameter-pro-flo-severe-du-t14-430936
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley L83 5.3L Severe Duty exhaust valves. Set of 8, 1.560in head diameter, XH-428 material.

Key Features

This product includes a set of 8 Manley Severe Duty exhaust valves.
Each valve has a 1.560-inch head diameter and a 0.3136-inch stem.
Constructed from XH-428 material, offering superior high-temperature tensile strength.
Features chrome stems and hard tips for improved durability.
Swirl-polished under-head areas and fully machined combustion faces aid airflow.
Designed for high-temperature gasoline engines, specifically Chevy L83 5.3L.

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About this part

Product Details

This set includes eight Manley Severe Duty exhaust valves, each featuring a 1.560-inch head diameter and a 0.3136-inch stem. These valves are specifically made for Chevy L83 5.3L engines, designed to handle the demands of high-temperature gasoline applications.

Crafted from XH-428 material, these exhaust valves offer exceptional strength at high temperatures, boasting nearly double the tensile strength of competing materials like EV-8 at 1500°F. The design includes swirl-polished under-head areas and fully machined combustion faces to help improve airflow and combustion efficiency. They also feature chrome stems and hard tips for added durability and a longer service life. Rigorous fatigue testing shows these valves can endure up to 100 million cycles under demanding conditions, significantly outlasting many competitors.