[Eljaro]

yes, there has to be a gap since some lifters are always up. You always have to push some valves open when installing the rocker shaft. It is normal.
What you have to check is that when the rocker stands are bolted all in, you should have only the allen screw head sticking out on top of the rocker when it is screwed all in and touching the pushrod on a closed valve. If you have more than 2 threads out your pushrods are probably too long.