The eighth character in the Vehicle Identification Number (VIN) identifies the engine. Adhesive-backed labels attached to the engine, laser etching or stampings on the engine block indicate the engine unit number/date code. All engines are stamped with a VIN derivative. For more information on the VIN derivative, refer to VIN Derivative .

The primary location (1) of the VIN derivative and the secondary location (2) of the VIN derivative for the 3400 (LA1) engine is above the starter motor on the engine block.