Lifter Not Pumping Up

Forged cranks never die, they just get welded up! You can dissect a lifter with a snap ring plier. maybe you got some trash in there. Lunati didn't make lifters....if you can put the lifter in a can under oil and use a pushrod to cycle it up and down a few times, it should pump rock hard in a few cycles. If not, take it apart and clean it.