Manley Performance Sport Compact stainless steel valves utilizeour exceptional Race Series alloy and are manufactured to thehighest 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.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.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 or driftingevents.