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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) , Engine Mechanical Specifications (LKW) , . If the cylinders exceed the specifications, the cylinder block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service. Refer to Cylinder Boring and Honing .
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