What material are these Manley exhaust valves made from?

These Manley Race Master exhaust valves are constructed from high-quality stainless steel, specifically XH-426, which is known for its durability and resistance to heat.

Are these valves suitable for all engine builds?

These valves are designed for engines operating under 8000 RPM and are particularly recommended for alcohol engines due to their robust construction and heat resistance. They are a good choice for bracket, drag, and oval track racing applications.

What is the benefit of the swirl polished and machined faces?

The swirl polished under-head areas and fully machined combustion faces are designed to improve airflow into the cylinder and optimize combustion efficiency. This can lead to better engine performance and smoother operation.

Specifications

Brand: Manley Performance
Part #: 11125-1
UPC: 807298056265

Manley 94-98 Toyota Supra 3.0L 30mm Head Dia 99.1mm Stock Length Race Master Exhaust Valve (Single)

Name: Manley 94-98 Toyota Supra 3.0L 30mm Head Dia 99.1mm Stock Length Race Master Exhaust Valve (Single)
Brand: Manley Performance
SKU: manley-performance-manley-94-98-toyota-supra-3-0l-30mm-head-dia-99-1mm-stock-len-t14-211345
Price: 28.71 USD
Availability: BackOrder

$28.71

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Fits 1993-2005 Lexus GS300. Manley Race Master exhaust valve for improved engine performance and durability.

Key Features

Fits 1993-2005 Lexus GS300.
Constructed from durable stainless steel (XH-426) for the exhaust valve.
Features chrome stems and hard tips for enhanced longevity and wear resistance.
Swirl polished under-head areas and fully machined combustion faces help optimize airflow.
Race Master style with a straight stem for performance applications.
Recommended for use in alcohol engines for reliable exhaust valve performance.

⚠️ 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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About this part

Product Details

If you're rebuilding the top end of your 1993-2005 Lexus GS300, especially for demanding track use, new exhaust valves are a critical component. These Manley Race Master exhaust valves are built to handle the heat and stress that come with high-RPM operation, up to 8000 RPM. They are constructed from durable stainless steel, specifically XH-426 for exhaust, ensuring they can withstand the harsh conditions inside the combustion chamber.

Manley has incorporated chrome stems and hard tips to increase their lifespan and resist wear, which is important for maintaining consistent valve sealing over time. The under-head areas are swirl polished to help smooth airflow into the cylinder, and the combustion faces are fully machined. This attention to detail helps optimize how air and fuel mix and burn, contributing to better engine efficiency. These are the straight stem 'Race Master' style, designed for optimal flow in performance applications.

These valves are also a recommended choice for exhaust valves in alcohol-fueled engines, which run hotter and require robust components. If you're looking for a well-built valve that can handle serious use, these Manley valves are a solid option for your GS300 rebuild.