It's not unusual for some to be loose while others are tight. It all depends on the position of the cam shaft and what valves are either open, closed or in between. Be very careful cleaning the top. There are holes that let the oil drain back down into the crankcase. You don't want any sludge plugging those holes.I have zero knowledge of actual engine building. (Willing to learn though) anything I should look for while I have the valve cover off? Some of the rockers have a little bit of play when wiggled as you can hear in this video. Others are solid. Any concern?
I'm big on that too. I like to refer to it as housekeeping. LOL.I am getting so intimate with this thing. I’m all up in the nether regions, cleaning, scrubbing, brushing, prepping to hit any little rust spots now while I can. This will be the last time I’m ever here unless I swap motors. It’s good to get so deep into a thing and know that I know what’s going on. Should y be any inch of this chassis that I haven’t touched by the time it’s back on the road.