They are non adjustable so only thing I can do it change them. Will have to put a mech gauge on to check oil psi.
actually if the preload is off (too little) to the point where it is causing the noise then you'd change the pushrods not the lifters but yes I am thinking lifter issue rather than preload but it needs to be checked & it s an easy check & far easier than a cam breakin procedure
live every 24 hour block of time like it's your last day on earth
