Engine Identification QSB4.5 and QSB6.7 Page E-4 Section E - Engine and System Identification NOTE: Depending on the manufacturing plant, calibration data may also be found on the engine dataplate. NOTE: If the engine dataplate (1) is not legible, the engine serial number (2) can be found on the engine block, on top of the lubricating oil cooler housing. Additional engine information can be found on the electronic control module (ECM) dataplate.