You will not have to.... and even if you did it would be waaay easier to do on your Duramax than on the older LB7's.The way I seem to drop parts in hard to reach spots when working on cars/trucks this might not be for me. Just purchased an '08 with 80,000 miles. Hope I don't have to do this in the near future
What are you using to remove them. Ive tried searching and searching and we tried a screwdriver and nothing removes them.... Other then that the driverside is a PITAYou will need to disconnect them, and you can slide the brackets down away from the valve cover, but you do not need to remove the lines completely.
Good luck..... Let us know how it went when you are done so others can get a feel for how easy/hard the job is..!! - Thanks!!