Why not a 413 ?

1Badcolt said

Once 440 blocks get harder find maybe some people will just attempt to open those early 413 blocks up to a 440 bore size.

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Don't need to go with a crazy overbore, the 413 bore size, stroke rod ratio is better than the 408 everyone is building. Nothing wrong with a 413 other than 440 are plentiful. Same issues with 383 and even 318 with 360.