Adjusting 350 rockers

[Boger]

Hi, new here to register here.

I have lurked around the forums for quite a bit, but I ran into a bit of a pickle.

GM Goodwrench crate 350 nothing fancy...Got a slight tick really have to listen to hear it.

I am 90% sure its the rockers are loosening up engine only has 40k miles, used bradpen 10-40 oil changed every 2000 miles.

Long story short truck was weekend cruiser turned daily driver (69 Chevy).

Here are my concerns:

Would it hurt to pull the covers and adjust all the rockers just to be safe? I know its coming from the drivers side thanks to my cut off broom handle.

Do hydraulic Flat Tappets go out of adjustment after so long?

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I have checked for exhaust leaks there are none (manifolds). It doesn't go away after engine warms up. My oil pressure is good 17-20 warm idle 35-40 cruising.

Just wanna make sure before I go out there to adjust rockers I am not wasting my time. Was also curious what else to look for before I go and try and adjust the rockers?


Was also going to make sure the method I was going to use to adjust the rockers is correct:

-Loosen rocker nut till slight clicking, tighten till clicking stops...Wait ten seconds make sure click doesn't come back
tighten 1/4 slowely, move onto next one?

I put the engine in myself, but this would be my first time attempting something like this.

Any advice would be awesome.