See Figures 1, 2 and 3
The engine, with which your specific vehicle is equipped, can be most easily identified by the Vehicle Identification Number (VIN), located on either the VIN tag, mounted in the upper left-hand corner of the instrument panel, or on the vehicle certification label, located on the driver's side door pillar. The engine identifying code is the 8th digit of the VIN. The engine VIN codes are as follows:
All Ford Mustangs should also have an engine emission calibration number label affixed to the driver's side door or door post pillar. The calibration number should be used when ordering replacement parts or when checking calibrations. Because engine parts will often differ, even within a given Cubic Inch Displacement (CID) family, verifying the calibration number will ensure that the proper parts are obtained. Consult your local dealer's parts department to determine any pertinent information regarding dates, optional equipment or revisions concerning the code for your engine.