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At the guide and seat machine, the heads begin to take shape. Ron reams and installs the bronze guides, hones and sizes the guide rod holes, cuts the valve job with a multi-angle carbide forming tool for a perfect cut on every seat, and ensures a proper valve depth. The angle of the valve job is preground into the tool from the factory to ensure an identical valve shape. Fox Lake has developed its own proprietary valve-seat angle for optimum airflow.