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Re: Official Difference btween the 396 and 402 BB Because you asked.
It was actually just marketing. There is no difference in the bore or otherwise. Think about the motorcycle market. They always fudge the cc to something that makes sense or keeps up with the competition. The Ford engineers were winning, so GM played a few tricks from year to year while they were in development of better engines. It was easy to fudge from 396 to 402 at a time when they were introducing the 400 small block. Workers on the factory floor were given liberty to liquidate emblems in batches. As long as they were in line with the models produced. There were no ISO standards back then. Just well kept factories.
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