It didn't...
It's clear that the writers of those pages knew less than perhaps they should have before they became authors of such a thing.
For instance, when putting a '59 six into a '48 model (one speaks of doing this and needing to change the flywheel), you have the issue of the number of flywheel attachment bolts to deal with.
Anyway, the page does say that the 265 inch version of the long block was the biggest six used in a Chrysler automobile. I think there was maybe something back in the late twenties that was bigger, but that was from the ZSB family of engines.
