What material are these Manley exhaust valves made from?

These Manley Race Series exhaust valves are constructed from high-quality stainless steel, specifically XH-426. They also feature chrome stems and hard tips for added durability and wear resistance.

What is the benefit of the swirl polished and fully machined design?

The swirl polished under-head areas and fully machined combustion faces are designed to optimize airflow into the combustion chamber. This can help improve combustion efficiency in your engine.

Are these valves suitable for any type of engine build?

Manley designs these valves for demanding applications like bracket, drag, and oval track racing, especially for engines operating under 8000 RPM. They are also specifically recommended as exhaust valves for alcohol engines.

Specifications

Brand: Manley Performance
Part #: 11521-8
UPC: 807298049489

Manley Small Block Chevy 1.500in Head Diameter Race Flo Exhaust Valves (Set of 8)

Name: Manley Small Block Chevy 1.500in Head Diameter Race Flo Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-small-block-chevy-1-500in-head-diameter-race-flo-exhau-t14-129317
Price: 218.97 USD
Availability: BackOrder

$218.97

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Performance Race Flo Exhaust Valves (Set of 8). Built for demanding Small Block Chevy engines up to 8000 RPM.

Key Features

Fits Small Block Chevy engines.
Set includes 8 exhaust valves.
Valves are constructed from durable stainless steel (XH-426).
Chrome stems and hard tips enhance longevity and wear resistance.
Swirl polished under-head areas and fully machined combustion faces optimize airflow.
Race Flo shape is suitable for specific racing engine requirements.

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About this part

Product Details

Manley Performance is well-known for making strong internal engine components, and their Race Series valves are a prime example. If you're rebuilding a Small Block Chevy engine that's going to see some serious action, like bracket racing, drag racing, or oval track, these Race Flo exhaust valves are built to handle it, especially if your engine will be operating under 8000 RPM.

These exhaust valves are made from stainless steel, specifically XH-426, which gives them solid durability. They also feature chrome stems and hard tips, adding to their wear resistance and making them last longer. The under-head areas are swirl polished and the combustion faces are fully machined. This design helps improve airflow into the combustion chamber and makes the most of your engine's efficiency. Manley also recommends these for alcohol-fueled engines, so they can stand up to those demanding conditions.