The confusers playing up so u missed another lengthy tirade !
Pushrods on a (stinking) hot engine should be rotateable (free)
when on the heel of the cam.(Off the lobe)for at least say 150 Deg
of cam rotation.
Actuation makes a noise.
A 'sounding rod' , std practise once , will let you hear em.
Say a pice of 1/8 dia steel rod , a foot long.
Place it on the cam box , and the rocker box.
other end adjacent to ear . NOT in the ear drum.
Dont trip / slip !
Correct adjustment shouldnt sound harsh.
HOT settings should have a slight clearance.
Burnt valves if not ancient are often caused by dirt on the seats.
The gas flow past hot seat tears it out.
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If you park your Masseratti Ghibli with the exhausts outside the garage doors,
you can use the same proceedure to 'sound' the valve 'Lash' .
Should NOT be bits being thrown about haphazardly, but controlled actuation
of free moving items.Horrible rattly noises are missadjustment or wear.
Like the old Triumphs that sound like a can of marbles.Worn followers and eratic clearances.
a well set one in good condition Doesnt. its rapsardous.Just needs a (piano?) tuners ear !
may require a long tube on ex. outlet ,dont get tangled in the airscrew. If you CAN hear them,
you can hear the lash,as in 'slack'.excessive slack would be a harder note.
Unless youve got progressive rate centreless ground Quality springs,to avoid mechanical collisions at wide(ish/er)) clearances.