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348 was a "Wide Block", 1st Generation big block.
Only Chevy actually made a "Big Block". Even back in the day. Today there's an assumption that anything over such-and-such displacement is a "big block". Cadillac for instance...500 cubic inches. Not a big block.
Buick/Oldsmobile/Pontiac 455 engines...none of them big blocks. None of them even the same block as each other, either.
The thing we classically think of when we think 'big block' would be the Chevy Mark IV "Turbo Jet V8" engines: rat motors like the 396, 402 ,427, and 454. But the big change from the W series was the design of the combustion chambers and a cylinder head at a 90* angle to the deck.
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