i just got a whole motor man. im sure that the block might have already been like that from the get go. I did have a wideband hooked up and all the numbers were adjusted in all rpms. i read 12's in WOT and they adjusted from part throttle to idle on the numbers it should have been. and every cylinder had the same grinding on them, 4 being the worse i looked at the cylinder walls closer and i can confirm the the walls were not touched at all