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 at elevated temperatures, making it well-suited for demanding engine conditions.

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

Manley's Severe Duty valves have undergone extensive fatigue testing and have shown impressive endurance, lasting up to 100 million cycles in simulated high-stress conditions. This is significantly longer than many competitor valves that fail much sooner.

Are any other components included with these valves?

This product listing is for a set of eight (8) Manley Severe Duty Series BBC stainless steel exhaust valves only. Other engine components or hardware are sold separately.

Specifications

Brand: Manley Performance
Part #: 11843-8
UPC: 807298053837

Manley Severe Duty Series BBC Stainless Steel Exhaust Valves 1.880in Dia 5.422in L - Set of 8

Name: Manley Severe Duty Series BBC Stainless Steel Exhaust Valves 1.880in Dia 5.422in L - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-severe-duty-series-bbc-stainless-steel-exhaust-valves--t14-492294
Price: 349.40 USD
Availability: BackOrder

$349.40

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Manley Severe Duty Series BBC Stainless Steel Exhaust Valves. Set of 8, 1.880in Dia x 5.422in L. Built for high-temp gasoline engines.

Key Features

This product is a set of 8 Manley Severe Duty Series BBC stainless steel exhaust valves.
Each valve measures 1.880 inches in diameter and 5.422 inches in length.
Constructed from XH-428 material, offering superior tensile strength at high temperatures for exhaust applications.
Designed for high-temperature gasoline engines, handling significant stress and heat.
Features chrome stems and hard tips for enhanced durability and longevity.
Swirl-polished under-head areas and fully machined combustion faces are included to improve airflow.

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About this part

Product Details

This set includes eight Manley Severe Duty Series stainless steel exhaust valves, each measuring 1.880 inches in diameter and 5.422 inches in length. These valves are specifically crafted for high-temperature gasoline engines, where they face significant stress and heat during operation. The material used for these exhaust valves, XH-428, offers nearly double the ultimate tensile strength at 1500°F compared to common competitor materials like EV-8, making them a strong choice for demanding applications.

Manley has put these valves through rigorous fatigue testing, simulating conditions where valves can experience extreme stress when bouncing on the seat. In these tests, the Severe Duty valves endured up to 100 million cycles at 40,000 psi and 1400°F, a performance that significantly outlasts many competitor valves which failed after only 100,000 cycles. They also feature chrome stems and hard tips for added durability, along with swirl-polished under-head areas and fully machined faces to help improve airflow and combustion efficiency.