youre not doing it right. you need to figure out how to keep the valves up when installing the keepers

you also need to center the spring on the valve. or learn how to slide the retainer around to drop the other keeper in. let me guess you are trying to DROP the keepers in , that is not the right way. buy the Omniman DVD an learn the correct way to install keepers, its a very simple process if you follow his or the factory service manual instructions

did you LAP the valves before you installed them? if not, you will have blow by and possible compression issues from the valves not sealing.

good luck