Allen recomended an LS6 cam for my '00 Sierra 5.3 with a whipple charger. I was looking for something very streetable that would pull hard. I'm planning to see Allen this comming week for the install. I'll post my opinion when it's finished.
No more trucks, but this is what I used to have. 2000 GMC Sierra, 6.0L-LQ4, Built 4L60, LS6 Cam, The Other Guys Headers, 3 inch exhaust and 7 chamber flowmaster, 43lb injectors, Nelson Tuning, Drop - 3/4 McGaughys Spindles, Bell Tech Shackles & Hangers. Best time 13.59 @ 106