For 1990-2009 cars only
| • | The Vehicle Identification Number (VIN) Derivative is located on the left side rear of the engine block (1) or on the right side rear (2) and typically is a 9 digit number stamped or laser etched onto the engine at the vehicle assembly plant. |
| - | The first digit identifies the division. |
| - | The second digit identifies the model year. |
| - | The third digit identifies the assembly plant. |
| - | The fourth through ninth digits are the last six digits of the VIN. |
| • | Engines built at the Romulus engine plant have the engine identification number located at the right front top of the engine block. |
| - | The first digit (1) is the source code. |
| - | The second and third digits (2) are the month of build. |
| - | The fourth digit (3) is the hour of the build. |
| - | The fifth and sixth digits (4) are the date of build. |
| - | The seventh, eighth, and ninth digits (5) are the broadcast code. |
