That's a good idea. Almost 90% positive it's cylinder 1 but I can narrow it. But I don't know why it's knocking... its got fresh bearings the were plastigaged. Only thing I can think is the crank is out of round. Idk. Kinda discouraging.
Just going to throw this out there but I had a slant 6 that several experienced mechanics thought had a rod knocking. After pulling the engine turns out the flexplate was cracked.