I have rebuilt my 5.3 LH6 with the AFM delete and put in a cam with a .020 higher lift, and my lobe seperation is not stock and duration does not meet Edelbrock standards so I have to make my own custom tune. I was wondering if anybody has done this. I am not looking for answers, I am very much involved in the HP tuners scene even though I just got into it. I have been working on cars at GM dealership all my life and I understand how it works. I know I have to replace my fuel pump and module for more flow but if anyone has any input on this I would greatly appreciate it. I would download some of my specifications except my engine is still out of the truck hopefully for a short time. Thanks for any body that has interest in this