Manley Performance has been manufacturing the finest stainless steel valves for over 40 years. Manley valves have been the standard of the industry since their inception;a fact that still remains true today as we’ve entered into new markets.

Manley Performance Chevy LS, Ford Modular, and Chrysler SB HEMI stainless steel valves utilize our exceptional “Race Series” alloy and are manufactured to the highest quality standards.

Manley valves are designed to outflow and outperform all others even in the most severe environments. Manley stainless valves feature gorgeous yet durable chrome stems, swirl polished under heads, fully hardened tips, completely machined combustion faces, closely controlled margin heights, and exact stem to seat concentricity to render a finished product that is unsurpassed.

Manley intake valves typically are built with our original “Pro-Flo” design which reduces the stem diameter in the fillet area for increased airflow but also less valve weight. This concept is executed on our Chevy LS and Chrysler HEMI parts.

In certain specific applications, Manley offers our “Extreme Duty” exhaust material. Our “Extremealloy” alloy offers more hot hardness and high temperature strength than our competitors’ offerings. This alloy is ideal for extremely high boosted applications where the exhaust gas temperatures reach what seem like unthinkable levels. In the case of the Ford Modular 4.6L and 5.4L 3 valve cylinder head engine, we chose to use Extremealloy.

Manley stainless valves are suitable for all applications ranging from the mild street performer to the jaw dropping 1000+ horsepower race cars competing at the drag strip.

Manley has been at the forefront with 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.

Application:

• 1999-2004 FORD F-150 BASE V8 5.4 GAS FI N
• 1999-2004 FORD MUSTANG GT V8 4.6 N