Big block vs small block, the great debate.
The factory decided at their little marketing meetings what they should call an engine, it has no basis in reality. I used to say that any engine that had a big block bolt pattern for the trans was a big block but even that can be shot full of holes if you consider the 351C which could have either pattern.
Basically you could say the terms were basterdized by the manufacturers and their marketing men long ago and nowadays are totally useless terms unless you want to argue forever about it.
Think of it this way, do you think a 400 Chevy small block is any better than a 400 Pontiac big block assuming all else is equal?
I didn't think so, the terms are useless unless you want to impress someone.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo