There's a thread on Dakota R/T forum about the 02-03 blocks having a couple extra holes for motor mounts on the sides. Apparently something's different mount wise in these years I guess. Someone is thinking the block is heavier duty also because they say the block weighs about 15lbs more. They say the cyl walls look thicker, but I'll wait on, at least, a stock to stock comparison between an 02 block and, say, a '99 for example. If done, it needs a sonic tester calibrated for that block's iron at a location where the exact thickness is known and hand tool measureable.