Seen this asked before on NastyZ28.
No good answer I have seen. It is on my original intake, but is I think its a number. No correspondence to a date. My guess is that due to it being a stamp and not a casting that it is done post molding and relates to a machining operation. Probably not warranty replacement. I've seen it on too many engines. Unless they replaced many intakes and I think we would have heard about that.
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior
Owned since 1978 - First Car
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