The engine identification number is stamped or laser-etched, either on a flat, machined surface, on the left-front of the engine block, near the water pump, or on the left-rear side of the engine block, where the transmission is joined to the engine.
Fig. Location of the engine identification number (1 and 2) which shows build location (3), build year (4), build month (5), build date (6) and build sequence (7)-4.2L engine
Fig. Location of the engine identification number (1)-5.3L and 6.0L engines