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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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