What material are these exhaust valves made from?

These Manley exhaust valves are made from XH-428 material. This material is chosen for its high tensile strength, especially at elevated temperatures like 1500°F, making it suitable for demanding engine conditions.

How do these valves compare to other brands in terms of durability?

Manley's Severe Duty valves have undergone rigorous fatigue testing and have shown a significantly longer lifespan compared to competitors. In tests, they endured up to 100 million cycles, while other valves failed much earlier, indicating a much greater fatigue life.

Are these valves suitable for all engine builds?

These valves are specifically designed for high-temperature gasoline engines, particularly those based on the Small Block Chevy (SBC) platform. Their robust construction and material properties make them ideal for performance applications where engine temperatures are elevated.

Specifications

Brand: Manley Performance
Part #: 11858-8
UPC: 807298054193

Manley Severe Duty Series SBC Stainless Steel Exhaust Valves 2.080in Dia 5.140in L - Set of 8

Name: Manley Severe Duty Series SBC Stainless Steel Exhaust Valves 2.080in Dia 5.140in L - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-severe-duty-series-sbc-stainless-steel-exhaust-valves--t14-473462
Price: 361.47 USD
Availability: BackOrder

$361.47

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Manley Severe Duty Series SBC Stainless Steel Exhaust Valves (Set of 8). Built for high-temp gasoline engines.

Key Features

This product includes a set of 8 Manley Severe Duty Series stainless steel exhaust valves.
Each valve has a 2.080-inch diameter and a 5.140-inch length.
Constructed from XH-428 material, offering high tensile strength at elevated temperatures.
Designed for use in high-temperature gasoline engines, including Small Block Chevy (SBC) applications.
Features chrome stems and hard tips for enhanced durability and longevity.
Swirl-polished under-head areas and fully machined faces improve airflow and combustion efficiency.

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About this part

Product Details

This set includes eight Manley Severe Duty Series stainless steel exhaust valves, each measuring 2.080 inches in diameter and 5.140 inches in length. These valves are specifically crafted for high-temperature gasoline engines, particularly those based on the Small Block Chevy (SBC) platform. They are designed to handle the intense conditions found in performance applications, offering improved durability and longevity over standard components.

Manley uses XH-428 material for these exhaust valves, a material that boasts nearly double the ultimate tensile strength at 1500°F compared to common alternatives like EV-8. This robust construction has been proven in rigorous fatigue tests, where these valves endured up to 100 million cycles at 40,000 psi and 1400°F, significantly outperforming competitors that failed much sooner. The valves also feature chrome stems and hard tips for added wear resistance, along with swirl-polished under-head areas and fully machined faces to promote better airflow and more efficient combustion.