What other types of engine blocks are there? Unless you meant cast iron? The problem with the internet is there are diamonds of truth in mountains of sand. It is pretty critical on the Ford diesel to keep the coolant up to snuff or you will start eroding something bad. Not sure if it is the radiator, the block or some other important bit and given my distaste for anything Ford, I suspect I don't recall because my brain is trying to purge anything related to Ford except not to buy one.
As long as your radiator does what it is supposed, it really doesn't matter.
Yes, cast iron. Sometimes my brain knows what I’m talking about and I forget to let everyone else know