mopar performance rocker shafts?

I can tell you in 1-2 days when my set of that PN arrives.

If the banana grooves do not extend beyond the inside edges of the stamped rockers, I don't see where it would matter to have the grooves or not. The oil will want to take the path of least resistance, and flow out of the hole and into the stamped rockers' slots rather than spread in the groove.