a couple years ago I purchased some Comp solid roller lifters just because they had a rebuilding service for those lifters. So when it came time to freshen the engine, I called Comp, they told me they got out of the rebuilding business. First I paid extra for the lifters because they were quote "rebuildable," second seems to me they owed it to their customers who purchased them, to at least notify them that they were cancelling the service. I will never buy a Comp lifter again. And the ones I purchased held up just fine, its the idea of the whole deal.