Valve guide and seat machining systems once were dominant only in aftermarket stock engine-rebuild shops. However, today's systems have grown beyond those shops and have found popularity with builders of high-performance engines for automobiles and motorcycles. A lot of valve guide and seat-machining systems are found in drag racing and NASCAR team shops. These shops produce new engine heads by machining them close to size with CNC equipment, and afterwards touch up the seats with a manual system that is dedicated to that process.
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