I should have mentioned, I just did T-belt/thermo/waterpump/steering pump and spark plugs 12 months ago, so all that is good I assume.
Valve covers are ok, but I have a noisy cam adjuster. Seems to operate ok.
I have heard of the issue on passenger side valve cover. Some have gotten it out with a bit of bending. Fortunately (?) my Driver side is the side making the noise. I think..