OK this thread is for people to post up what PSI, timing and octane they are running. Ive been scratching my head trying to figure how hard I can push my 5.3 with 93 pump gas so hopefully this thread will help. When I had the truck tuned it was tuned for 9psi and 16 degrees of timing. I recently turned it up to 13psi to beat a modded 5.0 and I was wondering how safe it is. I know I shouldnt have done it without running a log to see if I have any KR but it ran like a scalded dog. AFR was right at 11.0. How much boost/timing can I safely run on pump 93 octane? No meth right now and E85 is out of the question in Louisiana.