What material are the Manley exhaust valves made from?

These Manley exhaust valves are constructed from XH-428 material. This alloy is chosen for its exceptional strength at high temperatures, offering superior performance in demanding engine conditions.

How durable are these exhaust valves compared to others?

Manley's Severe Duty? valves have undergone rigorous fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400?F. This demonstrates a significantly improved fatigue life compared to many competitor valves.

Are these valves suitable for all engine types?

These specific exhaust valves are designed for high-temperature gasoline engines, particularly Chevrolet Big Block applications. Their material and construction are optimized for the stresses and heat found in these types of engines.

Manley Exhaust Valve Kit 1.940in Head 5.464in L 3715in Stem

Name: Manley Chevrolet Big Block Exhaust Valve Kit - 1.940in Head Dia. 5.464in O/A Length, 0.3715in Stem
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-big-block-exhaust-valve-kit-1-940in-head-dia-t14-879466
Price: 349.40 USD
Availability: BackOrder

Manley Chevrolet Big Block Exhaust Valve Kit - 1.940in Head Dia. 5.464in O/A Length, 0.3715in Stem

$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 Chevrolet Big Block Exhaust Valve Kit - 1.940in Head Dia. 5.464in O/A Length, 0.3715in Stem. Built for high-temp gasoline engines.

Key Features

This product is a Manley Chevrolet Big Block Exhaust Valve Kit.
Each valve has a 1.940-inch head diameter.
The overall length of each valve is 5.464 inches.
The stem diameter measures 0.3715 inches.
Exhaust valves are made from XH-428 material for high-temperature strength.
Features chrome stems and hard tips for enhanced durability.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

This kit includes Manley's Severe Duty? exhaust valves, specifically designed for Chevrolet Big Block engines. Each valve features a 1.940-inch head diameter, a 5.464-inch overall length, and a 0.3715-inch stem diameter. These valves are crafted from XH-428 material, a high-performance alloy chosen for its exceptional strength at elevated temperatures, making them ideal for demanding gasoline engine applications.

Manley's Severe Duty? valves are built to withstand extreme conditions. They've undergone rigorous fatigue testing, enduring up to 100 million cycles at 40,000 psi and 1400?F, which is significantly longer than many competitor valves. The XH-428 material offers nearly double the ultimate tensile strength at 1500?F compared to other common exhaust valve materials. These valves also feature chrome stems and hard tips for added durability, and their under-head areas are swirl-polished with fully machined combustion faces to help improve airflow and combustion efficiency.

If you're rebuilding a high-temperature gasoline engine, especially a Chevrolet Big Block, these valves are a solid option. They are designed to handle the stresses and heat associated with performance applications, offering improved fatigue life and material strength.