Where did this term "chunk" come from?

I have always had a thing about using the correct name for everything unless I was just joking around.
Eldebrock drives me nuts, as does any other term turned inside out or otherwise butchered.
The frickin letters are right there, it’s Edelbrock dammit.
I know it’s not always the case, but to me it hints at intentional ignorance and/or just plain lack of decent education.

The intentional use of a different term doesn’t bother me though.