Where is casting numbers located on 2.2L ecotec engine for 2003 Saturn Ion?

On the 2.2L Ecotec engine in a 2003 Saturn Ion, the casting numbers are typically located on the engine block, specifically on the driver's side, near the front or rear of the engine. You may also find them on the engine's oil pan or on the cylinder head. It's best to clean the area to make the numbers more visible before attempting to read them.