just put some ported irons on my car that I have worked on over the years and they have been surfaced twice. I used stock length push rods and now I found I have a collapsed lifter. Could to long of a pushrod cause this? I had no issues with the engine with around 5k on it with stock heads and only changed the heads now with only 400 miles with these heads number 2 piston intake lifter won't pump up. Thanks in advance.