See Figures 1, 2 and 3
The engine serial number is stamped on an engine block pad in order to identify the place and time of manufacture. In most cases the engine serial number will also contain a 1-3 digit code that identifies the engine type. In the case of single digit codes, this engine code may conform to the code used to identify the engine in the VIN.
The engine serial number is usually found on the front or rear of the engine block to the sides of the engine. In some cases other codes or engine labels are also found in the vicinity of the engine serial code pad or on the valve covers.
INLINE 6-CYLINDER ENGINES
On inline 6-cylinder engines, the serial number is found on a pad at the front right hand side of the cylinder block, just to the rear of the distributor.
V8 AND V6 ENGINES
On the 229 V6 (1967-84), 265 V6 (1985 and later) and most V8 engines, the serial number is found on a pad at the front right hand side of the cylinder block, just below the cylinder head. On the 231 V6, the number can be found on a pad on the left side of the cylinder block, where it meets the transmission.