What materials are these valves made from?

The exhaust valves are crafted from XH-428 material, and the intake valves are made from NK-844 material. Both are selected for their exceptional strength and performance at high temperatures.

How durable are these valves compared to others?

Manley's Severe Duty valves have demonstrated impressive fatigue life in testing, enduring up to 100 million cycles under stress. This is significantly longer than many competitor valves, which may fail much sooner.

What is included in this set?

This set includes eight severe duty valves, suitable for a typical V8 engine configuration.

Specifications

Brand: Manley Performance
Part #: 11712-8
UPC: 807298068541

Manley Chevy Small Block Severe Duty Valves (Set of 8)

Name: Manley Chevy Small Block Severe Duty Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-small-block-severe-duty-valves-set-of-8-t14-364318
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 Chevy Small Block Severe Duty Valves (Set of 8). Engineered for high-temperature gasoline engines.

Key Features

This set includes 8 severe duty valves for Chevy small block engines.
Exhaust valves are made from XH-428 material, known for its high tensile strength at elevated temperatures.
Intake valves are constructed from NK-844 material, offering superior tensile strength at high heat.
Valves have undergone fatigue testing, enduring up to 100 million cycles under stress.
Designed for high-temperature gasoline engines.
Features chrome stems and hard tips for enhanced durability.

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About this part

Product Details

When you're rebuilding the top end of your Chevy small block, especially for high-temperature gasoline engines, you need parts that can handle the stress. This set includes eight severe duty valves from Manley Performance, designed to keep your engine running strong. The exhaust valves are made from XH-428 material, and the intake valves use NK-844 material, both chosen for their exceptional strength at high temperatures.

These valves have been put through rigorous testing, showing they can endure up to 100 million cycles under extreme conditions where other valves might fail after just 100,000 cycles. They feature chrome stems and hard tips for added durability, and the under-head areas are swirl polished to help improve airflow into the combustion chamber. The combustion faces are also fully machined for better efficiency.

This set is a solid option for anyone looking for improved valve performance and longevity in their Chevy small block build.