What makes the XH-428 material special for exhaust valves?

The XH-428 stainless steel used for these exhaust valves offers exceptional strength at high temperatures. It boasts nearly double the ultimate tensile strength at 1500°F compared to common materials like EV-8, making it ideal for demanding engine conditions.

How durable are these valves under stress?

These valves have demonstrated impressive fatigue life, enduring up to 100 million cycles in testing at 40,000 psi and 1400°F. This level of durability is significantly higher than many competitor offerings.

Are any other parts included with these valves?

This product is a set of 8 exhaust valves. Other components like intake valves, valve springs, retainers, or seals are typically sold separately and may be needed for a complete engine build.

Specifications

Brand: Manley Performance
Part #: 11751-8
UPC: 807298052007

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-t14-4315588
Price: 349.40 USD
Availability: BackOrder

$349.40

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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 with XH-428 stainless steel for extreme durability in high-temp engines.

Key Features

Fits Small Block Chevy engines.
Exhaust valves are constructed from XH-428 stainless steel, offering superior strength at high temperatures.
Tested to withstand up to 100 million cycles at 40,000 psi and 1400°F, showing exceptional fatigue life.
Designed for high-temperature gasoline engines.
Features chrome stems and hard tips for enhanced durability.
Swirl-polished under head areas and fully machined combustion faces improve airflow.

These valves are designed for Small Block Chevy engines. Please verify compatibility with your specific engine configuration.

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About this part

Product Details

Starting with the XH-428 stainless steel material for the exhaust valves, these Manley Severe Duty Series valves are built for demanding Small Block Chevy applications. This material is chosen for its exceptional strength at high temperatures, offering nearly double the ultimate tensile strength at 1500°F compared to other common exhaust valve materials like EV-8.

These valves have undergone extensive fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400°F. This is a notable improvement over many competitor valves that might fail after only 100,000 cycles, meaning these are built to last under significant stress, even when valves bounce on the seat. The design includes swirl-polished under-head areas and fully machined faces to help optimize airflow into the combustion chamber.

Each valve features chrome stems and hard tips, adding to their overall durability and longevity. This set includes eight exhaust valves, making it a solid option for rebuilding or upgrading the top end of your Small Block Chevy engine.