The rocker shafts, while possible to install with the holes incorrect, it won't necessarily stop oil flow (with stock rockers). As long as the end plugs are installed properly, and the cam bearings installed correctly, it should oil. Now, with aftermarket rockers, as previously shown, might not oil properly due to a hole alignment mismatch. The original rockers have a channel in the middle of the rocker, and the aftermarket ones don't. As mentioned previously, shafts that have the diagonal grooves is what you need to fix this. If you look at early and late hemi rocker shafts, there is a groove for proper oiling, and this is what you are missing as OE wedge shafts only have a hole. The grooves help the additional hole get oil.
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