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Originally Posted by 73superduty
A tough question for sure on a great explanantion, however, if you were talking just Chevies, then the previous answers would be just fine. However, let's talk old school and Pontiacs.
Pontiac engines utilize the same block from the 326 all the way to the 455. So when someone says big block Pontiac, it isn't true.
The only difference is the size of the journals in the block thus giving it the cubic inches nomenclature.
Take a minute once and look at a 350, 400 and a 455 and you'll see the basic engine block for all of these cars.
If we go by what has been posted here, then yes the 400 and the 455 would be big blocks. Pontiacs call it standard. They just play with the internals.
Chris
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Actually, the 400 and 455 have different bearing sizes, so the 400 would not be included with the so-called Pontiac "big blocks".
400 internals are same as 350, 389, etc.
I think the 428 and 455 are the same, and maybe the 421.