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All the small block Chevy engines are based off the same architecture. A 283 small block looks the same from the outside physically as a 400 small block. The castings are machined somewhat differently internally for different displacements and they all have many common parts between them.
The big blocks are all based on different architecture (clean sheet of paper) and they do not share parts with small blocks for the most part. They are physicaly larger and heavier than small blocks externally. A 396 big block looks the same as a 454 big block from the outside. Distributors will interchange and maybe some small parts but other than that, the big block family of engines are completely different from the small block family of engines.
There is also a "W" block from way back in the early 60's. Completely different design. It looks VERY different due to the scalloped "W" shaped valve covers. Used for the famous "409" engine and some smaller displacements. Originally a truck engine design, they were hopped up by GM to be used in high performance car engines back before the big block design was completed.
Bottom line - small blocks are a completely different engine family from a big block.
-Mark.
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