adjustable rocker ?

Hope someone reads this didn't want to start another thread. When I went to adjust the rockers I found the pushrods where too long.I ordered a length checker this AM.It took 2 full turns before the threads started to show.I was wondering how much of the ball should be sticking out before I set the preload?I guess the pushrods that have in it now with the stamped rockers are also too long which might explain why it didn't run quite as strong as I thought it should.Any info would be appreciated.