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The motor needs to be vented or where else does the pressure go? Seems like the dipstick should lift up. I wonder how much pressure it takes to belly a pan? Maybe some pans are thinner and belly easier.

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Good points ..... and all engines have some degree of less than 100% ring-seal.

How much pressure would it take? ...I would think it would be EVERY BIT of the compression and ignition process of one cylinder !!

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I think the accumulation of pressure while running at high rpms with no pressure relief (read- plugged PCV/no breather) would do it.

I am every bit an iron based steel kinda guy though.