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"Safety code" on engine id plate?

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Anyone know the significence of the "safety code" on the engine compartment ID plate for S30s?

What do the codes on the last line, "7-1" or "8-4", signify? Someone said it referred to the size of the gas tank?? Another said it was some kind of "safety device indicator" ...?

I don't have a clue and would like to know.

Thank you!

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