Do solid lifter cams always need adjusting?

Oh god... get out of the 60's!! Yeah, maybe back when... when there were no screw-in studs, chrome moly push rods, roller rockers, Stellite alloy or Stainless steel valves, and the average cam (Duntov style) had a very wide .030" lash (hence the old term "30-30 cam") which literally beat the crap out of the valve tip.

Keep this in mind; almost every Honda, Toyota, VW, Mitsubishi, Nissan, Volvo and so on have over head cams, right? Most of those cams use clearances between the followers and the valve, which makes it a SOLID follower. Do THEY ever need adjusting? Almost never. If a valve is going out of adjustment it's because something is moving, wearing or bending. Press-in studs used to pull out. Stamped steel rockers used to beat the crap out of the valve tip, not only mushrooming the valve tip itself, but flattening-out the rocker tip which adds clearance and makes noise. Push rods used to bend and/or wear the tips out of off, and all sorts of other problems, but these days everything is so strong and stable, nothing wears, bends, pulls or mis-shapes to make the valve adjustment go out like it used to. I ran solid roller cams in many of the street and street/strip engines I built for people with an average of around .600" - .680" lifts with no need to re-adjust anything except maybe once every couple of years... if that.

Try not to listen to, or believe, old 50s and 60's wives tales. Those days are long gone.