Mopar engine differences

Swinger 340 said

I could be wrong but a 440 and 426 Weg is a Raise block (RB) and not called a Big Block (BB), the 426 Hemi is a class of its own. Don't forget the 413 RB.

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B and RB are both commonly referred to as "big blocks", it's a colloquial term. OEMs never really officially used the terms "small" or "big" block.

I've seen 2G Hemi referred to as the "big block Hemi" which it basically is, 426 RB with Hemi heads.