What material are these exhaust valves made from?

These Manley exhaust valves are made from XH-428 material. This is a specialized alloy chosen for its exceptional strength and durability at high temperatures, outperforming common alternatives.

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

The swirl-polished under-head areas, along with the fully machined combustion faces, are designed to help optimize airflow into the cylinder. This can contribute to improved combustion efficiency in your engine.

Are these valves suitable for all engine types?

These valves are specifically designed for high-temperature gasoline engines. Their robust construction and material make them a strong choice for performance builds where heat and stress are significant factors.

Specifications

Brand: Manley Performance
Part #: 11763-8
UPC: 807298052243

Manley Severe Duty Series Small Block Chevy Stainless Steel Exhaust Valves - Set of 8

Name: Manley Severe Duty Series Small Block Chevy Stainless Steel Exhaust Valves - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-severe-duty-series-small-block-chevy-stainless-steel-e-t14-4320816
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 Severe Duty Series Small Block Chevy Stainless Steel Exhaust Valves - Set of 8. Built for high-temp gasoline engines with superior fatigue life.

Key Features

This product includes a set of 8 Manley Severe Duty Series stainless steel exhaust valves.
Constructed from XH-428 material, offering superior tensile strength at high temperatures.
Tested to withstand up to 100 million cycles at 40,000 psi and 1400°F.
Features chrome stems and hard tips for enhanced durability and longevity.
Swirl-polished under-head areas and fully machined combustion faces improve airflow.
Designed for high-temperature gasoline engines.

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About this part

Product Details

This set includes eight Manley Severe Duty Series stainless steel exhaust valves, designed specifically for Small Block Chevy engines. These valves are crafted from XH-428 material, chosen for its exceptional strength at high temperatures, making them a solid option for demanding gasoline engine builds. They are built to withstand the intense stresses that valves encounter during operation, especially when bouncing on the seat, which can multiply the applied force significantly.

Manley's testing shows these exhaust valves can endure up to 100 million cycles at 40,000 psi and 1400°F, a notable improvement over competitor valves that failed much sooner. The design includes chrome stems and hard tips for added durability, along with swirl-polished under-head areas and fully machined faces to help optimize airflow and combustion efficiency. The XH-428 material itself offers nearly double the tensile strength at 1500°F compared to other common exhaust valve materials like EV-8.