What makes the XH-428 material special for exhaust valves?

The XH-428 material used for these exhaust valves boasts nearly double the ultimate tensile strength at 1500°F compared to common competitor materials like EV-8. This allows them to withstand extreme heat and stress in high-performance engines.

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

Manley's Severe Duty valves have undergone rigorous fatigue testing, enduring up to 100 million cycles at high temperatures and pressures. This is significantly more durable than many competitor valves, which may fail after only 100,000 cycles.

Are these valves suitable for all engine types?

These valves are specifically designed for high-temperature gasoline engines. While they are well-built, it's important to confirm they match the specific requirements of your engine build, including size and material needs.

Specifications

Brand: Manley Performance
Part #: 12344-8

Manley SR 20 Brodix Severe Duty Series Stainless Steel Exhaust Valves 2.400in Dia 6.030 L - Set of 8

Name: Manley SR 20 Brodix Severe Duty Series Stainless Steel Exhaust Valves 2.400in Dia 6.030 L - Set of 8
Brand: Manley Performance
SKU: manley-performance-manley-sr-20-brodix-severe-duty-series-stainless-steel-exhaus-t14-549475
Price: 361.47 USD
Availability: BackOrder

$361.47

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Manley SR 20 Brodix Severe Duty Series Stainless Steel Exhaust Valves 2.400in Dia 6.030 L - Set of 8. Built for high-temp gasoline engines with superior fatigue life.

Key Features

Fits various engines requiring 2.400 inch diameter, 6.030 inch length exhaust valves.
Constructed from XH-428 stainless steel, offering superior high-temperature strength.
Tested to withstand up to 100 million cycles at 40,000 psi and 1400°F.
Features chrome stems and hard tips for enhanced durability.
Swirl polished under head areas and fully machined combustion faces improve airflow.
Designed for high-temperature gasoline engines.

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About this part

Product Details

These Manley Severe Duty Series exhaust valves are made from XH-428 stainless steel, a material that offers nearly double the ultimate tensile strength at 1500°F compared to competing EV-8 materials. This makes them a well-built choice for high-temperature gasoline engines where durability under stress is critical. The valves measure 2.400 inches in diameter and are 6.030 inches long, coming as a set of eight.

Manley has put these valves through rigorous fatigue testing. Under normal operation, valves can experience stress from 20,000 to 60,000 lbs, especially when bouncing on the seat. These exhaust valves were tested at 40,000 psi and 1400°F, impressively enduring up to 100 million cycles. This is a significant improvement over competitor offerings that failed after only 100,000 cycles, demonstrating a fatigue life up to 1000 times better.

Beyond their material strength and fatigue resistance, these valves feature chrome stems and hard tips for added durability and longevity. The under-head areas are swirl polished, and the combustion faces are fully machined to help improve airflow and combustion efficiency. For intake valves, Manley uses NK-844 material, which has over four times the ultimate tensile strength of competing intake valve materials at 1000°F.