Piston - Selection

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The cylinder bore must be within the specifications for taper and out-of-round before fitting a piston.

Select a piston size based on the cylinder bore.

Fig 1: Identifying Cylinder Bore Measuring Directions
Courtesy of FORD MOTOR CO.

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 grade size on the new pistons indicates the position within the size range.

Choose the piston with the correct paint color or specific grade size.
- Refer to the appropriate article for the procedure.
  
  Fig 2: Identifying Piston Grade Size
  Courtesy of FORD MOTOR CO.