Well, I recently changed the oil after noticing "glitter" in the oil on the dipstick....still have the filter from THAT change and the one that just came off the motor.
Q, I've heard of cross drilling the crank, but not the block. I'll have to ask the machine shop about it.
If it was detonation related all the rod bearings would look about the same, right? Only 3 of the 8 showed any signs of advanced wear. All the others still looked great.