For over 40 years, Manley Performance has been manufacturing the finest stainless steel valves.
Since their inception, Manley valves have been the standard of the industry, a fact that remains true today as new markets have been entered.
Manufactured to the highest quality standards, Manley Performance Chevy LS, Ford Modular, and Chrysler SB HEMI stainless steel valves utilize our exceptional Race Series alloy.
Designed to outperform and outflow all others in the most severe environments, Manley stainless valves feature durable chrome stems, swirl polished underheads, fully hardened tips, completely machined combustion faces, closely controlled margin heights, and exact stem to seat concentricity to render an unsurpassed finished product.
Typically built with our original Pro-Flo design, Manley intake valves reduce the stem diameter in the fillet area for increased airflow and less valve weight.
This concept is executed on our Chevy LS and Chrysler HEMI parts.
In certain specific applications, our Extreme Duty exhaust material is offered.
Our Extremealloy alloy provides more hot hardness and high temperature strength than competitor offerings, ideal for extremely high boosted applications where exhaust gas temperatures reach unthinkable levels.
For the Ford Modular 4.6L and 5.4L 3 valve cylinder head engine, we chose to use Extremealloy.
Suitable for all applications, Manley stainless valves range from mild street performers to jaw-dropping 1000+ horsepower race cars competing at the drag strip.
Manley has been at the forefront of these niche markets, developing better flowing and stronger aftermarket valves for the Chevy LS and Ford Modular market before our competition.
We were the first to offer L-92 valves, and our hollow LS valves are the very best in the industry.
