Re: 454 block
I'm not aware of any casting dates after the '69 model year using only a single digit to represent the year of manufacture. I believe that stopped with the 1969 castings. Every 1970 and later cylinder case for 454 usage has as an example A 27 70 or B 17 71.
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2 1971 LS-6 Corvette coupes (Duntov's last stand)
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