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Its luck of the draw on stock pistons. 2 engines I had were 11 thou on the top ring.
When the front seal blows u will have blow by from a cracked ring land between the top and second ring, most likely.
If the rings butted enough to break the piston it would not have a perfect bore. Some scaring would occur. Happened to me. I was about 600 miles from home and drove it in. All I had to do was put in a set of Wesco's. No one had a drop in set at the time . That was about 20000 miles ago at about 700 wheel. Bore was in perfect shape. No hone no nothing. just gapped the rings to Wesco specs, I did put in the ls3 front seal. Did it with the engine still in the car. Not that bad really.
Now the damage can be much worse depending on the piston and how much damage.
I had another motor with over 20000 miles on it. Sized the number 8 rod making over 600 but pistons were perfect. Put a crank and 2 new rods used all same pistons and ran perfect.
Its crap stock pistons. some are better than others. Even some stock cars have broke ring lands.
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