Since our cars are so old and just the nature of the beasts in general, many of our cars don't even have their original motors. Over the years, many have been rebuilt (some, multiple times), and unless the build documents followed those motors, you
could have a 2.xL in a 1.7L bus case and not know it unless you open it up
I had what appeared to be a 1.8L motor that came out of a 914 I acquired a long time ago. It had a rebuild tag riveted over the factory stamped number, so I didn't even know what case it was, let alone what was inside it - so I listed it as a 'Mystery Motor'. Turned out, it
was a 1.8L bus motor ...