w2 valve train

T&D uses carbon fiber looking rings between the rockers, there is Maybe .002 clearance between both rockers and the shaft bolts, but no friction. Very well made, you get what you pay for I guess. Only place I see a torrington bearing in a motor is at the cam thrust plate. The hydrodynamic wedge of forced oil lubrication is hard to beat, practically no drag and cheap. And Torrington bearings need a hardened race to run against. Against a aluminum rocker is asking for trouble unless you run 2 thin washers around the bearing and now your back to AL on metal.