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Brooks Elliott Cylinder Heads is proud to use the Newen Contour, one aof the most technologically advanced tools in the business. The Contour employs the fixed turning method for machining valve seats. Other shops typically employ inferior types of machining tools, such as form tools that use the lapping technique, which can subject the head to chatter marks (far right), which is harmful to valves due to engine gasses leaking from the chatter marks during combustion/compression strokes of the engine firing cycle. Form tools can also cause undulations (middle) and waviness that are the result of irregular cutting efforts on a 360° rotation.