Is the bronze bushing required when using these? At what point (lobe lift/rpm/lifter diameter) do the Jesel Dog Bone Rollers become a necessity?

I appreciate you sharing. This level of stuff is so far over my head that just the tech side is fascinating.

The big twin turbo car is so over the top that I could only stare at it in amazement. Truly a testament of the quality, engineering, and craftsmanship that went into the build. Looking forward to more pictures.