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I do not believe a 7C or 7D dated castings ever existed.
The only C7ZE castings I've seen were: 6M22, 7B3 then 7E8.
Any other dates I have not seen nor heard of...seems there would more casting dates considering the needs...1175(GT350s) + 489(K-code Mustangs) + service replacements!
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7E11 is also a very common date.
Jon