What material are these valves made from?

These Manley Race Master exhaust valves are made 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 underhead area?

The swirl polished underhead area is designed to help optimize airflow into the combustion chamber. Combined with the fully machined combustion faces, this helps improve combustion efficiency.

Are these valves suitable for all engine types?

These valves are specifically designed for performance Small Block Chevy engines, particularly those used in bracket, drag, and oval track racing, operating under 8000 RPM. They are also recommended for exhaust valves in alcohol engines.

Specifications

Brand: Manley Performance
Part #: 11689-8
UPC: 807298092706

Manley LS-7 Small Block Chevy 1.615 Head DIA / .3136 Stem DIA Race Master Exhaust Valves (Set of 8)

Name: Manley LS-7 Small Block Chevy 1.615 Head DIA / .3136 Stem DIA Race Master Exhaust Valves (Set of 8)
Brand: Manley Performance
SKU: manley-performance-manley-ls-7-small-block-chevy-1-615-head-dia-3136-stem-dia-ra-t14-106585
Price: 235.06 USD
Availability: BackOrder

$235.06

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Manley LS-7 Small Block Chevy Race Master Exhaust Valves (Set of 8). Stainless steel construction for durability.

Key Features

Fits Small Block Chevy engines.
Set includes 8 exhaust valves.
Features a 1.615 inch head diameter and a .3136 inch stem diameter.
Constructed from durable XH-426 stainless steel for exhaust applications.
Chrome stems and hard tips enhance longevity and wear resistance.
Swirl polished underhead areas and fully machined combustion faces optimize airflow.

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About this part

Product Details

With a 1.615-inch head diameter and a .3136-inch stem diameter, these Manley Race Master exhaust valves are built for performance Small Block Chevy engines. They're constructed from high-quality stainless steel, specifically XH-426 for the exhaust, which offers solid durability for engines running up to 8000 RPM.

You'll find these valves feature chrome stems and hard tips, adding to their wear resistance and overall lifespan. The under-head areas are swirl polished to help improve airflow, and the combustion faces are fully machined. Manley also recommends these for exhaust valve use in alcohol-fueled engines, where they stand up to the demanding conditions.

This set includes eight valves, ready for your engine rebuild. If you're working on a bracket, drag, or oval track racing engine, these are a well-built option to consider.