Took off belt again to check pulley and all pulleys spun without anything noticeably bad.I also went ahead and took off valve cover forgot to record/take photos but all retainers and keeper showed no sign of cracking and nothing loose underneath valve cover; spun the crankshaft to see if anything was out of spec or moving (didnt see anything.)
I think it is for sure something that went bad in the block area so yeah that sucks but it was a high mileage motor and I definitely had a lot of fun with it. So now I think its time to save up for new motor just in case.
Most likely rod bearing going out.

 

Does the oil show any signs of excess metal?

 

So I replaced oil literally 3 days ago, Oil was dark but no sign of metal. (I do oil changes every 3k miles)

 

What metals and dirt did the oil analysis indicate?

-- Chuck

 

Final update, Motor is most likely done. The rod bearing is failing and my car is misfiring extremely bad. I can pull oil pan and see for sure if wanted but at a later time if I feel like it.

 

Time to look for a good used replacement.

 

I just watched your video now and immediately when I heard the sound I knew it wasn't valve, TCT or chain related but that it sounded like something much worse (rods/bottom end related). Sorry to hear it's a rod failing. Has the engine ever been starved of oil for an extended period of time?

 

Im not sure about previous owner and how he treated the car but I was actually pretty good with keeping my oil full. Maybe just normal wear?

 

I don't think rod knock is normal wear — unless the engine has a bazillion miles on it. It's prolly a sudden, critical loss of oil pressure.

 

What do you think could've caused that? Oil pump possibly? Hard driving that caused starvation?