[biketopia]

The broken bolts are easy if you have a mig welder. Pull the manifold, weld a nut to it and back it out. My 08 was pretty rusty being a PA truck so I new what I was in for and did everything at once. I cut the cats off so I didn't have to mess with trying to un bolt them from the manifolds. Also, at least bust loose any of the non broken bolts off by hand. Helps from making more work, usually even if you get a few turns and then they break, they don't do so flush and you can get a stud extractor on them or have really easy spot to weld a nut to. You wont hurt the head, done many of them this way. If you get to the point of needing to pull the heads to get the studs there should be nothing wrong with yours. Unless you have a ton of miles, in that case snag a set of ls6 spring from summit or the like to go with the cam you will put in and be good to go.