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Piston - Selection

NOTE: The cylinder bore must be within the specifications for taper and out- of- round before fitting a piston.
  1. Select a piston size based on the cylinder bore.
    Fig 1: Cylinder Bore Diameter
    G01103234Courtesy of FORD MOTOR CO.
    2. NOTE: For precision fit, new pistons are divided into three categories within each size range based on their relative position within the range. A number on the new pistons indicates the position within the size range.
  2. Choose the piston with the correct grade size.
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