i got some lifter noise when i start up the car and it goes away for the most part after a couple seconds. i think i hear a slight tapping noise from the rockers. they may not be shimmed right. i am using a fram filter, that could be it but i don't know since i just put some mufflers on the car and this is the first time i can hear the motor. i am using 10w40 oil. i took a valve cover off and i cranked it up. i am getting a lot of oil flow at idle at the first 2 rockers but the rest are not getting as much but they are getting enough i think. when the car is hot i am getting 20 psi and it goes up to 50 when i rev and drive it. i think i am getting enough oil psi. could this be bad lifters or the fram oil filter.