Why the overbore from 396 to 402 - The Supercar Registry

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11-05-2003, 05:52 AM

Kurt S Kurt S is offline

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Re: Why the overbore from 396 to 402

JoeC got it right. It was emission rules related.

The GM literature (parts books, manuals, etc) got real confusing, calling the BB a 400 alot of the time.

I assume the new block handled the .030 overbore.
Interestingly, the late 69 blocks did not use the 70 3 digit code format, but the late 69 axles did.

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