Precision Machining's Black Diamond valves are made of super quality stainless steel and machined with a profile that provides excellent flow characteristics. These lightweight valves are then impregnated through a very special process to 0.002" depth to improve wear properties and to reduce friction. This process provides greater resistance to corrosion and wear than what currently exists. Most valves are available either in original size or thin and larger diameter Be of tulip for manufacturers of high performance engines.
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