Cam's

[Gunner41]

So yesterday for giggles I dumped 2 qts of Marvel mystery oil in the engine. Yes I dropped two regular out. I was planning on 100 miles before oil change which is in a day or two. The ticking dropped 80-90%.... I also dumped some Berryman's fuel injection cleaner in the tank as well.
Yes the ticking is still there but very slight. I put a stethoscope and listened. The noise seems to come from L/S valve cover?
1. I pulled both valve covers and checked torque. Only one sucked and I replaced the spring. These are not adjustable.
2. Flushed the motor.
3. Fuel injection cleaner in the tank.
4. Used my shop vacuum to blow air in the exhaust and sprayed soapy water on the joints and found both my exhaust flange doughnuts are slightly leaking. My exhaust manifolds seem fine.
At this point it seems like its my injectors but the pressure seems fine or my lifters? I do know where to go from here and was hoping one of you real mechanics could point me in the right direction. Thanks