All instructions I have ever read states that is not needed to pump up lifters before installation, most do however suggest that you place them in a oil bath only for lubrication purposes....I pre-oil the motor with an 18 vdc Dewalt drill and rotate the engine at the same time with a remote starter trigger...I did this once Saturday and then again Sunday right before stabbing the distributer and starting the engine...starter it three times and the lifter tapping noise was so bad that I only let it run 10 to 15 seconds at a time to prevent any damage...Kim's comment was quote "that they had thought they hade corrected an oil bleed dwon issue"...end quote 8)