It was a rod bearing. Couldn't have even put a band aid on it, haha.
Sorry I havent updated this thread. Posted a pic of the 'what have you done to your square' thread, but that's it.
Finally got the engine pulled out and torn apart.
It ate threw the number one and number 2 rod bearing. Totally ruined my crank, connecting rods are junk, all egg shaped. What's left of the bearing was just flakes in the bottom. Only ran it for a couple seconds after it made the noise, but I guess that was enough.
The other 6 rod bearings weren't destroyed like those 2, but they were pretty heat scorched. Crank bearings weren't exactly beautiful either.
I could've sent the block out to het machines, and bought a whole master rebuild set with crank induced, or had mine machined to fit oversized bearings, but it just wasnt worth it to me.
Ended up just covering it with a trash bag and park it in the corner of my shop.
Just bought a brand new crate 350 long block threw O'Reillys. Ended up being cheaper than what I was gonna end up having to do, and I get a new reliable 350 with a 5 year unlimited mileage warranty. Oh well cwap happens.
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That's what my pan looked like.