My Pete rebuild

[Rawze]

yup ... those jake rockers should not be moving like that.

Should also keep in mind that the detents in the rocker shafts themselves are almost always at fault too, when they get that worn.

if it were mine, I would install...

* New OEM camshaft (the updated version with wider lobes).
* New OEM Rocker shafts.
* All new OEM rockers (the updated versions that match the new camshaft).

a bit pricey but at least it will go another million before it needs them again (as long as you keep after the engine maintenance properly).