I have an L83 long block with an LS7 intake and LT5 cam. I used the LT5 cam because it was cheap, deletes AFM and eventually I plan to put an LSA blower on this thing. I finally got it to lite off yesterday but I had to drop the flow rate of the injectors down 80% from their advertised flow rate. The injectors were a set of old LY6 injectors I had...so they might be faulty. I have a set of LS3 injectors I will try tomorrow or Friday.
Right now there is a cam phaser in there and it's disabled to 0. I will play around with some different angles looking at an LT4 map and see how that does. The LT5 cam at idle is probably the cause for the 13kpa at idle.
L83-LS7-LT5 first fire.hpl
2012 Sub 5.3 and 6L90 C1500 v1.7 runs.hpt
Anyway, feel free to offer comments.