Lifters never got enough oil and thats why so many solid rollers explode their needle bearing, they get to hot and dont get a Consistent oil supply. This is why all new style solid roller lifters have priority oiling to the roller, whether its a needle bearing or bushing. Keep them lubed, keep them cool and they last a lot longer. But you have to have the rest of the valve trian set up right as well or you have no hope. And if you need pushrod oiling, like a LOT of high end rocker systems today, you have to have oil to the lifters.