Manley Performance has been manufacturing the finest stainlesssteel valves for over 40 years. Manley valves have been thestandard of the industry since their inception a fact that stillremains true today as weve entered into new markets.Manley Performance Chevy LS, Ford Modular, andChrysler SB HEMI stainless steel valvesutilize our exceptional Race Series alloy and are manufactured tothe highest quality standards.Manley valves are designed to outflow and outperform all otherseven in the most severe environments. Manley stainless valvesfeature gorgeous yet durable chrome stems, swirl polished underheads, fully hardened tips, completely machined combustion faces,closely controlled margin heights, and exact stem to seatconcentricity to render a finished product that is unsurpassed.Manley intake valves typically are built with our originalPro-Flo design which reduces the stem diameter in the fillet areafor increased airflow but also less valve weight. This concept isexecuted on our Chevy LS and ChryslerHEMI parts.In certain specific applications, Manley offers our ExtremeDuty exhaust material. Our Extremealloy alloy offers more hothardness and high temperature strength than our competitorsofferings. This alloy is ideal for extremely high boostedapplications where the exhaust gas temperatures reach what seemlike unthinkable levels. In the case of the Ford Modular 4.6L and5.4L 3 valve cylinder head engine, we chose to useExtremealloy.Manley stainless valves are suitable for all applicationsranging 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 marketsdeveloping better flowing and stronger aftermarket valves for theChevy LS and Ford Modular market before ourcompetition. We were the first to offer L-92 valves and our hollowLS valves are the very best in the industry.