Slippery wrote: If it was me, I would remove the oil pan and check the rod bearings, maybe a main to check them. I know you say that the noise came from the top, but if all the lifter "pills" are in place I would move elsewhere unless the problem is obvious. I hope it wasn't a loud exhaust leak.
I dont want to say I told you so but ... I told you so 
At least now you know what needs to be fixed.
So the real question is why it did that. Any signs of bluing of the rods or other mains?
Didn't notice any discoloration, the rod cap on #3 still looked good, but I heard it was loose on the crank even when the rod bolts were still tight so it will probably have to be replaced.
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