Dont know what your lifter problem history is, but I once had bad lifter
problems. Against advice, I only replaced 2 lifters,and got ok results. 2
lifters had collapsed.Gunk was the villian.I tried to readjust the old
lifters cause I thought I had air bound lifters as per Bently.I adjusted as
per Bently (lash +2 turns).Got a no compression condition.Too much turning
past lash.Collapsed 2 of the 8 lifters.I got a sea foam like engine solvent
and cleaned out some gunk.Readjusted the lifters to lash + 1/4 turn and
have good results.A lifter only has motion of 1/15 of an inch, and 2 turns
is more than that.The bently says that after bleeding the air, by setting
to .006,it is ok to leave it there most times. I did a 1/4 turnin addition
to lash to hit the 1/15 inch travel near the middle.Worked for me.