Henry_b
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Finally fixed the cruise control today to give me something else to think about, then went for a blast to see how much fuel i could burn!! Still getting occasional light tapping at idle i didn't check the lifters spun freely when i rebuilt i get the idea i should have.
Consensus seems to be to sand the bottom of the offending lifter with 320grit just enough to give the cam something to grab hold of and try again... Or go for a blast down the motorway in 3rd with fingers crossed..
Did the followers slide in/out of their bores?
If yes then they should spin freely without issue.
The noise you're hearing is more likely IMO to be rocker related
I wouldn't sand anything with 320 grit, sanding a wear face that will be honed against the new cam all you'll do is partially remove the slight crown ground into the follower face which is typically less than 0.004 and is copied on the cam faces taper these are critical follower/cam face angles that need to match for proper rotation and break in.