So I might be looking at a compound problem here, I'm not sure. Running a 283 SBC, stock original. Had a slight on and off again tick when I got it rolling a few months ago and thought I eliminated it by getting the timing and valve lash correct, but now it RETURNS!!! This particular intake valve on #6 already has a stud that's about 3 threads higher than all the others, but from what I can tell, it's not working its way out. I can loosen the nut to the same point before it gets "clackety", but it still retains the "tick", all the way to the bottom of the stud...in other words, once you take the slack out, it retains its tick even if you tighten it all the way down. During the tightening, the tick will disappear briefly, only to return once you've stopped tightening. The tick does not increase or decrease in volume or repetition. However, it will speed up as RPM are increased. While you're doing this, the engine's idle is affected very little whatsoever. If it's a collapsed or sticking lifter, would using some MMO or Seafoam do the trick, perhaps? It just kinda blows...just really got it on the road, timing tweaked, carb set.....I'd LOVE it if it were an MMO fix and I didn't have to take off the intake...but it is what it is. Thoughts?