6.1 help!

The crank is different. The snout of the crank specifically. You can buy aftermarket cranks for about $800. There is abolsutely nothing wrong with going to a 4.05 stroke or 4.08.......hell there are 4.2 stroke cranks out there. If you want a good combo try the 3.9 stroke. At a 4.07 bore it makes a 406 which is a great motor. 3.9 stroke makes it so you dont have to cut back the oil squirters or remove them all together