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. The primary location of the VIN derivative for the 3.8 L engine is above the starter motor on the engine block and in the center of the LH rocker arm or LH side of the engine in the oil pan rail area of the engine. 5.7L engine ID number will be located rear of LH cylinder head or the front part of LH oil pan rail.