New lifter install help me understand

I'm wondering if you have enough preload with the new lifter. Was the lifter you replaced an original? There's been some talk here of there being a different height on the plungers between big and small block lifters and now they pretty much just sell a universal size for everything. Don't remember exactly, but a thread search may turn something up. If you do have enough preload then 67Dart273 has a point about oiling.