I think that a detailed report is in order as to what was my engine tick. Hopefully this will help someone else who faces this issue in future.
When I got my current truck, there was a faint ticking sound from the engine. We did a flush and put in RL. That stopped it, or so it seemed. A couple of months ago, the ticking sound came back. This when I started posting videos on here to try and guess what it could be. Hoping that it was the manifold bolt issue and not a lifter. At the time, the mechanic didn't take the manifold out, he just checked the bolts and they seemed to be OK. So we deduced that it was a lifter.
Decided on an oil change using Redline 5w40, but there was no stock. I had to use Amsoil SS 5w40. It didn't really work. The ticking just got worse and louder.
Based off a jeep forum post, I then tried a bit of seafoam, which seemed to make it quieter and until it almost disappeared and then I went in for the oil change. But just before the oil change, the ticking came back.
Using a mechanic's stethoscope, the mechanic was able to deduce that the ticking was coming from the manifold as well as the heads, on both banks.
It seemed my problem was two fold. One of the manifold bolts had sheered, resulting in one tick and another tick was coming from inside as a couple of the lifters had failed.
The manifold bolt was jammed in the head and in order to get it out, the head had to come off, so a rebuild was anyway on the cards.
The mechanic did his best to only change what needed and stuck to best recommended practices as possible. It was still expensive though.
I would have liked to use Redline, but my budgets were getting stretched real thin and the mechanic suggested using a less expensive oil, but from a known brand like Mobil one or Castrol. I had become intrigued at using Castrol Magnatec and this gave a good chance to try out a different strategy at preventing the tick. Maybe by doing this, I could help someone else.
Right now it is running on Castrol Magnatec Start Stop 5w30. Will be moving on just standard Magnatec later on or maybe Edge. I'm hoping that this would work.
I am also trying to find a local place that will do the same kind of testing that Blackstone does.