K member & 400 B Big Block question.

Cudaman77 said

Any recommendations on finding a forged 383 crank. All sites I’m finding are using a 440 crank and different rods.

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Yep that makes a 451.
You just have to keep looking, it should be cheap when you find one because nobody uses a 383 crank anymore. If you really want to find one look for a 413 crank and you will find 6 383 crankshafts. :)