Can't tell if I'm hearing lifter or rocker rattle.

[Black70c10]

So I've noticed over the last few weeks this rapid ticking noise coming from the passenger side valve cover, and I'm not sure if this is an issue with the lifter or the rocker arm..

Before we go any further, I tried to determine if I have hydraulic or solid lifters.. I used cylinder #8 to test, cranked by hand, watched the exhaust valve open and close, followed by intake valve open and close, and stopped once they evened back out and did not move with crank rotation meaning I'm on the compression stroke. I then tried to push down on the rocker (pushrod side) with all my force and there was no movement at all... Does this confirm solid lifters?

If so, and I pinpoint the one making the noise, does anyone have any suggestions as to determine if this is a lifter issue or maybe the rocker arm needs adjusting? I've read solid lifters need occasional adjustments. Thanks for the help