Adjusting valves/ pushrods on T/A heads

[72 Challenger]

I need my e-body family again!

My Duster developed a nice knock while in winter storage. Due to my own lack of knowledge, I didn't think adjustable valves because I have never owned a small block mopar  that had adjustable valves.

Today I learnt that T/A heads have adjustable valves.

My question is how? Hold the screw with a screw driver and tighten or loosen the nut? Anyone have a step by step? I have never adjusted a valve in my life.

I'm aware I could have a dead lifter but I'm trying to rule that out. I'd like to adjust the valve and then turn the motor over and see if the issue persists.

All advice welcome.

I did rip the oil filter apart and found no metal in it at all so I'm fairly confident the camshaft is okay.

[Rich G.]

The nut is the lock, loosen the nut and turn the screw to adjust the valve. And then tighten the nut to lock the adjustment.

[anlauto]

Prior to the 340 becoming popular, most A Bodies came with a 273...They all had adjustable rockers that "look" like the famous expensive T/A rockers, but they are not the same at all..

[MoparLeo]

My standard answer on most questions on this site is to look it up in the FSM, ( Factory Service Manual) available free on this site.

[bentpshrods]

      I put the 273 adjustable rockers om mine. Set the valve lash at zero using this sequence. 

[Bullitt-]

 more info here... https://forum.e-bodies.org/engine-transmission-and-rear-end/4/set-valve-lash-340-with-adjustable-rockers/5876/