See Figures 1 and 2
The engine that the factory installed can be identified by one of the digits of the Vehicle Identification Number (VIN) as explained earlier in this section. The engine itself can be identified by the engine serial number. The cubic in. displacement is given by the second, third, and fourth, or the third, fourth, and fifth digits of the engine serial number. This will vary depending on the year and engine.
Inline 6-cylinder engines have their serial number stamped on the joint face of the block, just below the No. 6 spark plug.
318 and 360 cu. in. V8s have the number on the front of the block, just below the left cylinder head.
The 225 cu. in. and the 238 cu. in. 6-cylinders have the serial number stamped on a pad at the right side of the block.
400 cu. in. V8s have the number on the right side of the block ahead of the distributor base.
See Figures 3 and 4
440 cu. in. V8s are numbered on the left bank front tappet rail.
There is a quick way of telling the small block 318 and 360 cu. in. V8s from the 400 and 440s. On the 318 and 360s, the distributor is at the rear of the engine, while the 400 and 440 cu. in. V8s have it at the front.