What material are these exhaust valves made from and why is it important?

These exhaust valves are made from XH-428 stainless steel. This material offers nearly double the tensile strength at high temperatures compared to common competitor materials, making them ideal for handling the extreme heat and stress in gasoline engines.

How durable are these Manley valves compared to others?

Manley's Severe Duty valves have undergone rigorous fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400°F. This is significantly longer than many competitor valves, which may fail after only 100,000 cycles.

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

The swirl-polished area under the valve head is designed to help improve airflow into the combustion chamber. This can contribute to more efficient combustion and better overall engine performance.

Specifications

Brand: Manley Performance
Part #: 11853-8
UPC: 807298054070

Manley Severe Duty Series Small Block Chevy Stainless Steel 1.655in Exhaust Valves - Set of 8

Name: Manley Severe Duty Series Small Block Chevy Stainless Steel 1.655in Exhaust Valves - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-severe-duty-series-small-block-chevy-stainless-steel-1-t14-4375063
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley Severe Duty Series Small Block Chevy Stainless Steel 1.655in Exhaust Valves - Set of 8. Built for high-temp gasoline engines and extreme durability.

Key Features

Fits Small Block Chevy engines.
Set includes 8 exhaust valves.
Made from XH-428 stainless steel for high-temperature strength.
Features chrome stems and hard tips for durability.
Swirl-polished under head areas and machined combustion faces improve airflow.
Tested to withstand 100 million cycles at 40,000 psi and 1400°F.

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About this part

Product Details

If you're rebuilding the top end of a Small Block Chevy engine, especially for demanding applications, paying close attention to your valves is crucial. These Manley Severe Duty Series exhaust valves are crafted from XH-428 stainless steel, a material chosen for its exceptional strength at high temperatures. This means they can handle the intense heat and stress inside your engine, cycle after cycle.

Manley put these valves through some serious testing, pushing them to 40,000 psi and 1400 degrees Fahrenheit. They held up for an incredible 100 million cycles, which is about a thousand times longer than some other valves they tested. The valves also feature chrome stems and hard tips for added wear resistance, and the under-head area is swirl-polished to help improve airflow into the combustion chamber.

This set includes eight exhaust valves, all made to fit Small Block Chevy engines. They're a solid option if you need valves that can stand up to tough conditions and keep performing reliably.