Your right, the 400M is based on a Clevland (351 C) block, my mistake. It's easy to confuse the two.
400M runs a 4" Windsor crank and has the same bore spacing. It also has the same head bolt pattern as a Windsor. The block oiling is different (NON PRIORITY), the deck hieght is different, the HEADS are substantially different and as I recall the BELL HOUSING is a 429-460 bolt pattern? So it is indeed a different block. I've heard it called "M" for modified or "Michigan" but never a Midland?
So the question remains: How the heck does Ford get a .125 over bore if this block is in fact a Windsor, or even a Cleveland for that matter, with the same bore spacing.
Max, the Dart iron eagle block you refer to is a real head scratcher. That must be a completely new design with larger bore centers in order to get THAT big bore!
The Windsor block vs Cleveland block priority or non priority oiling system is much like the center vs side oiler FE debate. Which is "adequate" depends largely on how hard your "racing".
From Ford as it regards this block:
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4.125" bore capacity (sonic check recommended), finished at 3.990" to 3.995" rough bore
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