Maximum bore on 383

Have it sonic tested.
The typical Mopar BB ends up with a cylinder or two that’s core shifted pretty bad....... and that one ends up determining how big you can go.

Unless something is pretty far off, .060 should be safe, but I’d prefer a sonic test before doing it, especially if I’m looking to stroke it, and/or make some pretty good power with it.

There’s some pretty good general block info on the 440Source site.