Not having a good day today.

Pulled the Pig jug for routine inspection today after the first tank, and this is what I found.


Notice the long crack in the center of the smaller hole? (Top pic is upside down) It looks like something was wedged between the wall and the slug, yet there are NO marks (other than normal wear) on the piston ON EITHER SIDE! The only sign of damage on the slug is the top which is is all dinged to hello from running the chunks through it, as is my new FredHead, which you KNOW is bunching my panties quite tight.
Both transfers wasted with chunks run through the works, no sign of debris or ring damage. It would have messed up a ring if they had snagged BOTH of the lips. No shiny dust or bits remain. The only possible I can figure is a foreign object somehow getting past my briggs air filter (also leaving no sign)
No strange noises?!?!?
I find it baffling that this could happen with no odd symptoms or strange noises at all, especially considering how anal I am about every little noise or change when running in a newly assembled motor.
The only thing I noticed at all was an inconsistent idle, which I figured was simply from the top end being so fresh.
I'm beginning to think this motor is haunted or something.
Maybe it's the re-incarnated soul of one of the thousands of helpless mechanical victims claimed by my younger days as a speed freak come back to make me pay for my engine sins.
All I know is I'm getting real tired of this musical engine baloney.
*trudges out to re-re-re-re-re-swap the Pig motor. Again.*

I could understand had the damage been on the same side I touched up after the first top end failure, but this is both transfers, with the untouched side being the worse of the two!
This, plus the untouched rings leads me to believe it had nothing to do with the previous problem. This was NOT another ring snag! (at least not unless this piston is made of diamond!)
I can find no evidence to explain this except the cylinder wall collapsed over both transfers for some unknown reason, or I somehow sucked a chunk of something hard through my air cleaner.
Maybe a chunk popped off the case under a stud. I'll have to check that when I get it out.
Just blows my mind this could happen without my noticing or hearing anything at all.

Okay. I think it went like this:
The original ring snag must have damaged the transfer lip more than I thought and started a small crack in the lip which broke off under power and caused enough debris to get sucked up into the other transfer, breaking off the big chunk, which then had carnal knowledge of my new FredHead.
Once again it seems to boil down to MY error in not replacing the cylinder.
In my defense, I DID inspect it and very carefully de-burred the small notch left from the first go-round. The only way I could have spotted this hidden defect would have been with dye and revealer. (magnaflux don't work on aluminum)
Lesson learned. Never trust a china cylinder that has had ANY debris run through it, regardless of how it looks.
*shakes head and slowly wanders off muttering*

I did rinse out the bottom end real well with nothing showing so I slapped another cylinder on it. Fired right up and doing fine so far. Aside from a few dings on the crown from the chunks, the piston is untouched. Rings were free and undamaged. Pure blind luck.
It simply blows my mind that I heard and felt NOTHING when this happened. It might have been yesterday or last week for all I know.

I know. But I'm tired of working on it. If it blows again, then I'll do a complete teardown.
The beauty of the china girl is that even catastrophic damage is really no big deal.