Assembly laziness.
CHI 4V heads. ARP studs, Comp Cams guide plates and rocker arms.
The ID of the guide plates was slightly larger than the diameter of the studs and thus allowed the guide plates to be adjusted for correct, or incorrect, positioning.
I had cautioned the engine builder that guide plate alignment was often troublesome for assemblies like this and if necessary they are sometimes cut, properly positioned and then welded to retain correct alignment.
and yet he delivered the engine to me as pictured. 😡😡
The previous photo was the worst example of misalignment but not the only example.
The third shop found they were able to obtain correct alignment with judicious attention to correct alignment as allowed by the ID versus OD diameter differences.
Larry