All true, yet the main difference was the 326, 350, 389 400 and 421 all have small Crank Journals, while the 428, and the 455's have the large Crank Journals.

Pontiacs have the large C.I. displacements, but truly no large or small blocks. Most will just refer to them as a Big Block Terms used for (Chevy, Mopar and Ford).

So just tell them they were all the same size block, just different internas to make more C.I. and much more HP! Not that they will really understand, but you tried!

Brett - 67 Drop Top 455!