How tight to set solid lifters

Mine clatter when cold and hot
the sound changes as the motor heats up

its a feature of my engine
this is a reason the Australians call them rattlies
they rattle a bit with Hydraulic lifters they rattle more with solid

BUT i set them as the cam card said 20 thou on both, cold.
i even approach this by winding engine forward and back wards to take out any twist and flex in my long cam
Its still a noisy rattly bastard

how do you come up with a setting for a motor that always had hydraulic lifters that were preloaded mostly the same as a 318 would be, can't remember 40 60 or 80 thou that now has solid lifters and adjustable rockers

can't help feeling the cam grinder just picked "safe"

i should try setting them hot. if its good enough for a slant 6 it should be good enough for its younger brother...

when its not freezing or raining or both

id expect the pushrods to get longer slightly
ide expect the valve to get longer slightly
but id also expect the block to get taller slightly
and the head to get thicker slightly

do i end up back where i started?
none of this mattered with hydraulic lifters would standard pushrods expand more then nice new clay smith pushrods ?
if i chop 60 thou off the head does it expand less due to less metal more due to less mass

aaaaaaargh
etc

Dave