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Measuring Cylinder Bore Taper

    Fig 1: Measuring Head Gasket Dimensions
    GM4973Courtesy of GENERAL MOTORS COMPANY
  1. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 10 mm (0.394 in) below the deck surface (1) and record your measurement.
  2. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 125 mm (4.921 in) below the deck surface (2) and record your measurement.
  3. Calculate the difference between the 2 measurements. The result will be the cylinder taper.
  4. Compare your results with the Engine Mechanical Specifications (LTG) . If the cylinders exceed the specifications, replace the engine block.
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