[NeighborsComplaint]

The fact that those roller lifters try to self-align themselves with no spring pressure on them whatsoever with the cam being slowly turned by hand doesn't really sell me. In a real world environment of half engine RPM, heavy valve springs and the inertial load of the lifter mass, their action is going to be a little different don't you think?

The fact that there are so many link bar failures tells me the rollers aren't exactly self-aligning themselves in actual operation and I think the knife edge of those flat plates is not going to last very long as the lifters attempt to rotate. Think about the way your pushrod guide plates are constructed. They are heavy gauge steel plate with wide wear surfaces (turned down lips) that are self-gusseted in the stamping process just for the pushrods that slide by.