Engine Identification

Fig 1: Locating Engine Identification Tags

Courtesy of GENERAL MOTORS CORP.

The Vehicle Identification Number - VIN derivative (1) for 3900 LZ9 is stamped or laser etched on the front and left side of the engine block. The Vehicle Identification Number - VIN derivative is nine digits long and can be used to determine if a vehicle contains the original engine.

• 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.