Piston Selection

3.5L, 3.7L and 5.0L (4V) Engines 

1. Engines are equipped with a single grade size piston.

   6.2L (2V) Engines 

   NOTE: The cylinder bore must be within the specifications for taper and out-of-round before fitting a piston.
2. Select a piston size based on the cylinder bore.
   Fig 1: Checking Cylinder Bore Top

   Courtesy of FORD MOTOR CO.
3. NOTE: For precision fit, new pistons are divided into 3 categories within each size range based on their relative position within the range. A paint spot or specific size grade on a new piston indicates the position within the size range.

   Choose the piston with the correct paint color or specific size grade.

   • Refer to the appropriate Engine article for the procedure.
     Fig 2: Locating Piston Paint Color

     Courtesy of FORD MOTOR CO.