How durable are these valves compared to others?

Manley's Severe Duty valves have demonstrated impressive fatigue life, enduring up to 100 million cycles in testing at 40,000 psi and 1400°F. This is significantly longer than many competitor valves which may fail after only 100,000 cycles.

Are any other parts needed for installation?

This set includes eight exhaust valves. It is recommended to consult the manufacturer's installation instructions for any additional components or specific procedures required for proper installation.

Specifications

Brand: Manley Performance
Part #: 12347-8
UPC: 807298086019

Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo/Severe Duty Exhaust Valves (Set of 8)

Name: Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo/Severe Duty Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-chevy-lt-1-6-2l-1-590in-head-diameter-pro-flo-severe-d-t14-120064
Price: 349.40 USD
Availability: InStock

$349.40

Only 4 left in stock

Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo/Severe Duty Exhaust Valves (Set of 8). Built with XH-428 material for extreme durability.

Key Features

Set of 8 exhaust valves for Chevy LT-1 6.2L engines.
Features a 1.590-inch head diameter and a .3136-inch stem.
Constructed from XH-428 material, known for its high tensile strength at elevated temperatures.
Chrome stems and hard tips enhance durability and longevity.
Swirl polished under head areas and fully machined combustion faces improve airflow and combustion efficiency.
Designed for high-temperature gasoline engines and proven through rigorous fatigue testing.

These valves are designed for Chevy LT-1 6.2L engines. Please verify compatibility with your specific vehicle application.

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About this part

Product Details

Starting with the XH-428 material for the exhaust valves, Manley has developed a component that stands up to serious heat and stress. These Pro Flo/Severe Duty valves are specifically made for Chevy LT-1 6.2L engines, featuring a 1.590-inch head diameter and a .3136-inch stem. This isn't just about replacing a worn part; it's about building an engine that can handle more.

The XH-428 material is notable for its strength at high temperatures, offering nearly double the ultimate tensile strength at 1500°F compared to common EV-8 material. Manley also includes chrome stems and hard tips for added wear resistance. The under-head areas are swirl polished, and the combustion faces are fully machined to help improve airflow into the cylinder, contributing to better combustion efficiency. These valves have undergone rigorous fatigue testing, enduring up to 100 million cycles at high stress and temperature levels, far outperforming many competitor parts that fail much sooner.

This set includes eight exhaust valves, ready for installation in your LT-1 6.2L engine. If you're rebuilding the top end or looking for improved durability under demanding conditions, these valves are a solid option.