GM Service Manual Online
For 1990-2009 cars only

Object Number: 180875  Size: SH

The engine identification number is located on the right front side of the engine block (1). The engine identification number gives specific information about the assembly of the engine. If reading the identification number from the left the following information can be obtained:

    • The first digit identifies the plant code.
    • The second and third digits give the month of the engine build.
    • The fourth and fifth digits describe the date of engine build.
    • The sixth, seventh, eighth digits give the engine broadcast code.

The Vehicle Identification Number (VIN) Derivative is located on the left rear side of the engine block (2) and is a nine digit number stamped or laser etched onto the engine at the vehicle assembly plant. If reading the identification number from the left the following information can be obtained:

    • 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 Vehicle Identification Number (VIN).

Engine Verification Label


Object Number: 492039  Size: SH

The engine verification label is placed in two locations on the right side of the engine.

    • On the back of the valve rocker arm cover (1)
    • On the side of the oil pan (2)

The engine verification label displays the bar code and the broadcast code that identifies the engine RPO, transmission RPO and other component RPOs that the engine includes and excludes.