Ok, ok. I will try and dip into the memory bank here:
1999-2002
4.8L (LR4) 270 hp/285 ft. lb.
5.3L (LM7) 285 hp/325 ft/ lb.
6.0L (LQ4) 300 hp/360 ft. lb.
8.1L (L18) 340 hp/455 ft. lb. (01-04 only?)
02-07 Classic
4.8L (LR4) 285 hp/290 ft. lb.
5.3L (LM7) 295 hp/335 ft. lb.
5.3L FF--E85 (L59) 295 hp/335 ft. lb.
5.3L HO (L33; 05-07 Classic) 310hp/335 ft. lb. (available in EC 4WD only)
6.0L (LQ4) 325 hp/370 ft. lb.
6.0L HO (LQ9--VortecMAX, had special high-compression 10:1, flat-top pistons) 345 hp/380 ft. lb.
That is as much as I know from 1999-2007 Classic. I am sure if you need the NBS hp figures, you can go to GM's website.