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Presumably, if you only hear it while accelerating, then you only hear it while your inside the cab. Unless you have a side-car.
Broken manifold bolts, lifters, etc are most noticeable from outside the truck, especially if you listen near the wheel wells.
Injector noise is pretty audible from inside the cab. Is the insulated hood pad and the plastic engine cover in-place? Without those in place, the injector noise is significantly louder from inside the cab. Especially under acceleration, when the injectors are working hardest.
If you're worried about lifters/manifolds, then listen from outside, near the wheel wells.
It doesn't sound like typical hemi lifter tick. Stuck valve maybe, maybe flex plat but it doesn't sound rotational to me. Take a piece of paper with engine on to tail pipe, see if it tries to suck in and flutter or of it only pushes out. Normally a stuck/sticky valves is going to have a lot of other symptoms, but sometimes not, see if it is early stuck valve. No other symptoms?
But wouldn't a stuck valve be stuck at different times? This only happens under acceleration. I will do the old paper on the tail pipe. I can't remember when I did that. LOL I think I am going to stick a stethoscope on top of each injector as well, but you would think I'd get a fault. I have the alfa OBD and it comes up clean.
Are you talking about exhaust in general or the exhaust manifolds?
You need new exhaust manifolds that is 100% your noise its not the usual hemi tick just manifolds.. they warp and the bolts snap Once the manifolds are off you will need a welder to get the old studs out do not drill them.
Exhaust pipes
