Well the plot thickens...
#2 Piston, valve imprint, heavy pitting with hole burrowed into the corner of the reliefYou must be registered for see images attach
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#4 Piston, another pinhole in the piston
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#6 Piston deep dents from foreign objects and indent in the top of the piston from the prechamber not being installed all the way.
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This is precisely why you should have someone experienced with these engines rebuild your idi for you, it’s clear there was too much material taken off the driver side head, and to put the nail in the coffin for that head, it’s cracked between all the valves. I’d be curious to hear what @IDIBRONCO thinks of the holes in the pistons.
Now that looks like shiiit!!