Mine bushed lifters have pressurised oiling. How ever until this past year the axle oil hole was .045" below the bottom of the lifter bushing at base circle. Not to mention the lifter bushings were loose at around .0025"-.003". So there was plenty of oil running around the lifter. It also pushrod oils. That wasn't an issue. The new bushings are fit at .0015" and hang down far enough to cover the wheel/axle oil feed hole. However they ran 550 passes in the previous configuration.
Doug