Before I do something silly....

Is it really necessary to soak hydraulic lifters in oil (to fill them) before fitting? My head has been off and whilst I haven't actually removed or replaced the lifters, I stood the head on its end for a couple of days to inspect the chambers and clean it. I'm concerned that during that time my lifters will have bled off their oil and hence now be dry again.

Any advice appreciated!

Cheers

Kurt