What material are these exhaust valves made from?

These exhaust valves are made from XH-428 stainless steel. This material is chosen for its exceptional strength at high temperatures, offering significantly better performance than common alternatives in demanding engine conditions.

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

Manley's Severe Duty valves have demonstrated up to 1000 times better fatigue life in testing compared to competitor offerings. They endured up to 100 million cycles at high stress and temperature, while others failed much sooner.

Are any other parts included with these valves?

This product is a set of eight exhaust valves. Other components for engine rebuilding, such as intake valves or valve springs, are sold separately.

Specifications

Brand: Manley Performance
Part #: 11850-8
UPC: 807298054001

Manley Severe Duty Series BBC Stainless Steel Exhaust Valves 2.250in Dia 5.344in L - Set of 8

Name: Manley Severe Duty Series BBC Stainless Steel Exhaust Valves 2.250in Dia 5.344in L - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-severe-duty-series-bbc-stainless-steel-exhaust-valves--t14-145003
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley Severe Duty Series BBC Stainless Steel Exhaust Valves 2.250in Dia 5.344in L - Set of 8. Built for high-temp gasoline engines with exceptional fatigue life.

Key Features

Fits Big Block Chevrolet (BBC) engines.
Set includes eight exhaust valves.
Each valve measures 2.250 inches in diameter and 5.344 inches in length.
Constructed from XH-428 stainless steel, known for high tensile strength at elevated temperatures.
Features chrome stems and hard tips for increased durability and longevity.
Swirl-polished under-head areas and machined combustion faces help optimize airflow and combustion.

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About this part

Product Details

Manley Performance is well-known for making strong engine components, and their Severe Duty? Series valves are a prime example of that commitment. These exhaust valves are specifically built for big block Chevrolet (BBC) engines that run hot, like those found in performance or racing applications. They are crafted from XH-428 stainless steel, a material Manley uses because it holds up incredibly well under high temperatures and stress, offering nearly double the strength at 1500?F compared to other common exhaust valve materials.

What really sets these valves apart is their durability. They've been put through tough fatigue tests, enduring up to 100 million cycles at 40,000 psi and 1400?F. This is a staggering improvement over many competitor valves that can fail after just 100,000 cycles, meaning these Manley valves can last up to 1000 times longer under demanding conditions. They also feature chrome stems and hard tips for added wear resistance, and the under-head areas are swirl-polished to help improve airflow into the cylinder for better combustion efficiency.

This set includes eight exhaust valves, each measuring 2.250 inches in diameter and 5.344 inches in length. If you're rebuilding the top end of a high-performance BBC engine and need valves that can handle extreme heat and stress reliably for a long time, these are a solid option.