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I remember hearing way back in 71 that the 402 came about because GM had
accumulated a number of 396 blocks that were bored a little too big to meet
specs. Instead of trashing the blocks they bored them to .030 over and
continued to call them 396s in 71 and in 72 they called them 400s.
Although I never verified the story, it does sound like a good way to salvage
some of their investment rather than turning the blocks into scrap.
Bill Vander Werf
396guy wrote:
> Replies to this message are sent to The Chevelle Mailing List
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>
> > If memory serves, the 400 Turbo-Jet was actually a 402 BBC. BTW, a .060"
> > over 396 is a 408 (I think), not a 406. Somebody want to verify the
> > math?
>
> I think you're correct on both counts. A 396 (4.094) bore that's bored
> +.060 to 4.154 is 407.663 (give or take a few thousandths) and rounds to
> 408. All big block engines were referred to as "Turbo-Jet" and all small
> blocks were "Turbo-Fire" designate. The "396" moniker was so popular that
> when they introduced the 402 big block, they still called it a 396 and
> retained the 396 badging.
>
> Dale McIntosh
> ACES #1709/TC #92 Gold
> GR8PMKN - 67 SS
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