I believe it's due to what I call cubic-inch-to-block-mass (CIBM) ratio.
The D361 has a low CIBM ratio, meaning the holes for the cylinders are fairly small compared to the size of the block.
You've got thermal mass there to soak up the heat and radiate it away in a controlled manner. There's more material in the block, which reduces its tendency to flex, twist, shrink, or grow under heavy loads and high temperatures (don't kid yourself, engine blocks DO twist and flex).
As soon as you start punching out the holes for more cubes, and clearancing the bottom end for longer strokes, you're removing valuable material that was making the block more durable.
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