Everything deforms, but to what magnitude, I don't know. It's probably in microns.
A 4 bolt mount should have a slighter bowing effect, leaving a microscopic gap right over the middle of the core, and pressing against the core's corners. IMO, bad!
So the cutouts ensure that if there's any bowing, the block will press on the opposite edges of the core, leaving a gap across the entire middle/center. Better support, sacrificing a good gap to protect the core.
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