I hear the same noise, I believed it to be the injectors firing. Honestly I never noticed it till I was in the truck with two other people in in and the radio was off as we we're talking. During the times of no conversation I began to notice it. It's very faint. And now that I've heard it once, it's like I hear it every time , it's very very faint and only hear if the radio is off and no one is talking.
I have a question for UPR , in the single valve set up, there is a check valve in line to the pcv port. Why is the check valve needed and can it be removed, as I believe there is a check valve in the pcv valve from the factory? The 6.2l I believe there is a check valve in the pcv that you plug into. I'm not sure about the 5.3 but I would think it is the same.
Is there a lower thermostat to install or a different way other than tapping and treading in a plug. I'd like to come up with something that can be easily changed or not easily detectable for any type of warranty work.
Is there a 185 or 190 t-stat option ?
Would you be will to share your UOA with me in a PM. I just got mine back from Blackstone and I would like to to compare your results. My silicon content was a little high as well but could be from a new motor, I'll have to see what they look like in the next UOA. Thanks
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