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They did not make a 400 sb Chevy in 1974. But from 1975 to 1980 they did and the answer to your question is 8.5:1 from 1975 to 1977 Then from 1977 to 1980 it was 8.3:1 ratio. That is Advertised compression ratio.
I may stand corrected on the date when I said they did not make a 400SB. But The info. I gave you was all I could find. NEUTZ.
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