Hey guys and gals I'm new here.Well I need some help with my new cam. I installed a ls1 hot cam in my truck. The truck is a 06 GMC with a 5.3 in it. It has 3.73s, K&N cia, Pacesetter shorty headders, stock Y-pipe, and a 3 inch cat back with a cut out and 40 series Flowmaster that exits in the stock location. I use a Diablo sport tuner. Before the cam swap The truck had run a best time of 15.74@ 87 m.p.h. with a 2.46 60ft. with out wheel spin. I installed the cam on Friday the 15th . I did not use the LS6 springs. The stockers are still in there. I went to the track to tune the truck. The motor revs fast but feel lazy below 3500. After that if feels like it pulls hard.Well the times say everything. 16.38@ 85 mph.It does not valve float, its not pinging, its not running lean or rich. The knock retard is not pulling timing according to my real time data on the diablo sport. What gives? I know I should put the springs in. Do I need shorter push rods? Maybe the valves arn't seating all the way. Is the tune crap? Just need some advice. Thanks.