There is a “check valve” in the lifter to keep them pumped up. As for lifters, Howard’s, Hughes, Rhoads, Isky. You can find them from 10 to 60 bucks. It depends on what metal the lifters are made out of will for the price. And nope once a lifter in “mated” to a lobe, it is best to keep the lifter to that lobe for life..
