See Figures 1, 2, 3, 4 and 5
All engine assemblies carry an engine identification number (EIN). On 2.2 liter and 2.5 liter engines, the EIN is located on the face of the engine block, directly under the cylinder head (left side of vehicle).
On 1984-90 2.6 liter, 3.0 liter and 3.3 liter engines, the EIN is located on the left side of the engine block between the core plug and the rear face of the block (radiator side of vehicle). On the 1991-95 3.0 liter, 3.3 liter and 3.8 liter engines, the engine serial number (E.I.N) is located on the rear face of the engine block, directly below the cylinder head.