SJBlackZ28

i wanna know the symptom I would feel if i had either one low oil pressure or a bad lifter , my car is making a ticking sound from the passenger head but cant figure what it is, i took the vavle cover off and checked the rockers and all feel good, some are saying a bad lifter since I got my car tune about a week ago, Since they tweak and hit the rev limter and were tuning for couple of hours maybe one of my lifter went out. it make a constant tick sound but really slow or fast depending on the car idle.