You can't just push the oil out of oil filled lifters. The valve spring pressure itself needs a little time to bleed the lifters of oil on an engine when not running. Whenever I adjust the lifters on an adjustable lifter engine when lifters are oil filled, I find the pushrods will not turn easily by hand, so I continue to turn eng over and finish adjusting them all. If you then let it sit 5 minutes or so, the pushrods will then all spin by hand as long as cam is on base circle. Your situation sounds like too long of pushrods as somebody mentioned.