most of what kills a roller lifter is too much lash. The wheel needs to stay on the lobe, if it bounces, things break. Need enough pressure to keep it in contact. On the flip side, too much pressure without enough oil can cause the needles to fail. I don't have any answers on what's the best for your application. Be nice if you could get some Isky pressurized bushed roller lifters, but I understand they are very sensitive to dirt in the oil.