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Valve Head O.D. and Chamfer Measurement Procedure

    Fig 1: View Of Valve Head O.D. & Chamfer
    GM2371865Courtesy of GENERAL MOTORS COMPANY
  1. Measure the valve head O.D. and chamfer (a) using an appropriate scale. Refer to Engine Mechanical Specifications (LTG) .
  2. If the valve head O.D. and chamfer is within specification, test the valve (1) for seat concentricity using the Valve-to-Seat Concentricity Measurement Procedure. Reinspect the valve head O.D. and chamfer after completing the concentricity measurement if valve seat reconditioning is performed.
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