273 rockers on e-heads

when those heads first came out they didn’t use spring cups.
The spring pocket was cut to something like 1.480, and then there were just shims under the springs.
The machined pocket is what located the springs.
Fundamentally that’s not a problem, but Ede didn’t use heat treated shims, so the spring dampers would chew up the shims over time.

The first set I had here where they had cut the spring pockets to a larger OD and used actual spring cups was within the last 18 months or so.
I don’t get too many of those heads thru here, so I don’t have a good handle on the timeline when that change was implemented.