1970 cutlass motor 350ci

[shaks 442 clone]

what year 400ci motors crank will fit in a 1970 olds 350 ?

are they the same engine family ?

or is a 383ci olds not possible ?

[88 coupe]

Originally Posted by shaks 442 clone

what year 400ci motors crank will fit in a 1970 olds 350? ........

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.

........ are they the same engine family? ........

Yes. Same block, just different deck heights and crank journal sizes.

........ is a 383ci olds not possible ?

More than possible. Any competent engine builder can handle it. It is what they do.

Question is, why?

Norm