Blake Thornton wrote
Well, if soft lifters never go away, then should they be replaced?  I'm
not too concerned about it since it seems to be running ok, but maybe this
summer when its warmer I might be interested in replacing the soft ones

Blake 
my comment was may never go away and that goes for the new one also 
Im not saying don't bother to replace tired lifters but there is no guarantee
that it will solve the air in the lifters problem. even if you bleed the lifter before you install 
it
I am a real believer in marvel mistery oil a day or so before the oil is changed. it has 
time and time again proven itself to me as a great way to quiet down lifters 
Bob 
Bob