Hydraulic FT issues/rumors?

Stock rebuild is the only thing I would put a hyd lifter in and even that I might change the rockers and go solid flat tappet. If you have performance goals for this engine I see adjustable rockers in your future anyway. You check to see if the lifter rotates with the valve train adjusted and the intake off. You turn the motor over by hand. If they all rotate by just hand rotating the engine they should be fine. Solid flat tappet with EDM hole in lifter face is what I run.