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Originally Posted by shaks 442 clone
what year 400ci motors crank will fit in a 1970 olds 350? ........
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Doesn't matter what year it is, a 350 is a 350.
Neither one is a direct bolt in, because the main journals are larger. Same reason a Chev 400 crank will not a bolt into a Chev 350 without grinding the mains down.
With your stock bore, an early 400 crank would make it 412 CI, and a late one would take it to 440 CI. If it was worth the effort, it would already be common practice, and you would not have asked the question.
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........ are they the same engine family? ........
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Yes. Same block, just different deck heights and crank journal sizes.
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........ is a 383ci olds not possible ?
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More than possible. Any competent engine builder can handle it. It is what they do.
Question is, why?
Norm