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Not sure if there is a meaning other then to keep the case halves together. You don't want to mismatch halves between engines as they are machined together so they put matching numbers on each half. I would assume they start at a certain number and when they get to 999 they start over.
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92 964 RSRish project
01 996TT
95 325i
92 318i
etc, etc, etc
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