Anyone Run Valve Stem Caps With Hydro Lifters?

[Darius]

As the topic title says, I am looking into using valve stem caps to take up the tiny bit of slack in the hydraulic lifters due to short valves provided to me by Ferrea. I had to have them custom cut because they do not make a valve for the S1/S2 RB25DET motors, only the R34 RB25DET. I don't want to have to pull my head off and get new valves or a new valve job if I can avoid it. Does anyone have experience in running these or something similar and what are your impressions?