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Re: Official Difference btween the 396 and 402 BB Because you asked.
Quote:
Originally Posted by leddzepp
As told to me by someone who worked for GM (you won't find it in any book or brochure): The 396 blocks had a casting imperfection in the cylinders, so rather than scrap all of them, GM "fixed" the problem by punching them .030 over making it a 402.
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Close but not quite right. The reason they were over bored making the 402 was because the cylinders were cast crooked. To straighten them they had to re bore them straight making them 402 instead of 396. This came from my best friends grandfather who was one of the people fixing them at the time it happened.
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