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I can't believe with all my Mopar books I can't find the main bore min-max size for a 400. Thanks for your help.

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Well the stock-min size for the 400 is 4.342. As for max, less is better. Keep the bores as thick as possible. Dont try to gain CI with the bores.

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You're not going to find anyone publishing a "max overbore". It depends on the particular block you're working with. Have it sonic checked.