i can't get any set of flat tappet lifters to hold over night , even without rocker arm load . some will hold pressure , never the same bore . get i got to go one good one at a time . i've got a bench full of lifters , here goes day by day . pulled the plugs so it rotates easy with the start , turn it over with the starter until i get pressure up lifters , then a few more to keep it there . and come back a day later and check them for piston plunge , keep the ones that hold . and replace the rest . start it again . anyone know a better way ? please tell me . and no the customer wants a quite motor the start without any rattles . even after a month or more of setting . its just a clean driver , i want the same thing for him . it just a 340 la block and heads , nothing trick , just well dome .