Lifter noise

I've had problems with Comp lifters doing that but never a Lunati. You may have a piece of trash in the lifter allowing it to bleed down. You need to find out which lifter it is and pull it out (you can do that by removing the rocker arm assy and pushrod and using a telescoping heavy duty magnet pick up tool to reach down in and pull it out. Just be super careful not to drop it down inside the engine). Take the lifter apart and see if it has trash in it. If so clean it and re-install it. If not it's probably a junk lifter.