Originally Posted by sbc1320
CNC?-Older blocks with longer ID pad thicker blocks generally?
From what I see the later blocks maybe better because of technology gains, I have about 25 blocks where one cylinder has failed making the block junk for a performance build.
Going by core shift is a poor indicator from what I have seen.
I don't give ill advice or look into the crystal ball I sonic test each block. I move alot of blocks in a years time not many OEM's since the Dart SHP block. When I do have OEM block guys do want them sonic tested.
I wish I could base all my info on just one block