Could use some help identifying some roller rockers

it appears there's no lash cap on Earth that could work there without contacting the locks.

I agree.

Magnum valves have very little space from the lock groove to the tip.
In my mind, a lash cap would need to have very little depth to be able to contact the tip and not the locks.

Frankly, I’d say the whole spring/retainer/lock situation on those heads needs a re-do.

Factory set up:

IMG_4083.png

IMG_4084.png

IMG_4086.png