[red 928]

Beginning in 1970, Chevy decided to bore the 396 out to make a total displacement of 402 cid.
No vehicles had the original 396 after 1969, with the exception of the Chevy C/K trucks, which had it until 1970.

Yet, while Chevy may have upped the displacement to 402, the marketing department evidently didn’t get the memo.
Chevy continued to brand the new 402 as either a 396 big block or as a new “Turbo-Jet 400.”
To make things even more complicated, there actually was another 400 cid small block engine.
Chevy marketed the small block as the “Turbo-Fire 400,” to contrast with the Turbo-Jet.
In 1972, Chevy finally cut the BS and started referring to the LS-3, the only 402 left, by its proper displacement.
They then promptly discontinued the engine the following year

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https://musclecarclub.com/chevy-396-402-big-block-guide/#From396to402cid