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Valve Margin Measurement Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the valve margin using an appropriate scale.
  2. Reference the specifications in this section for minimum valve margin and compare them to your measurements.
  3. If the valve margins are beyond specification, replace the valves.
  4. If the valve margins are within specification and do not require refacing, test the valve for seat concentricity using the Valve-to-Seat Concentricity Measurement Procedure.
    Fig 1: Measuring Valve Margin
    G01815888Courtesy of GENERAL MOTORS CORP.
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