Hughes "retro fit" lifter not pumping up!

well thats what i'm about to try now . but they have piss holes in the top , hope they work this time , i'm going to WEAROUT the threads in these heads . never have i had so many issues with lifters , and this thing is just a driver , no big anything . 850 idle to 5k smooth good power . pull the timing out of it , should run on 87 oc gas .