The Crower hydraulic camsavers use a very small machined flat on the side of the lifter to allow more oil to drizzle on the cam without bleeding the lifter. You almost wouldn't see it unless you were looking for it,Are these EDM lifters available for hyd cams or are they solids only? I can only find them listed for solid applications.
https://www.summitracing.com/parts/cro-66000x3-16