See Figures 1, 2, 3, 4 and 5
The engine identification tag identifies the cubic inch displacement of the engine, the model year, the year and month in which the engine was built, where it was built and the change level number. The change level is usually the number one (1), unless there are parts on the engine that will not be completely interchangeable and will require minor modification.
The engine identification tag is usually located on the valve cover on all engines except the 7.3L diesels. The diesel engine ID number is stamped on the front of the block in front of the left cylinder head.
The engine identification code is located in the VIN at the eighth digit. The VIN can be found in the safety certification decal and the VIN plate at the upper left side of the dash panel. Refer to the "Engine Application" chart for engine VIN codes.