Some one ask so I tried to explain in a PM. Rocker oiling

Oldmanmopar said

Torqued to the same spec as required per ARP. There is no instructions for stretch specification for these studs , As stated there is less material at the base of the threads then what is left after being cut out of the shaft. This was all done to our original studs at a performance engine shop around 2007. We never had and issue and my son has been using this method on every studded LA small block in his shop. There are many other methods but the cost is a lot more, for example here is one I have seen to correct oiling. Great system but didn't want to go that route. Just something else to leak externally

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The method shown here of feeding the LA head's rocker shaft off the oil pressure port is not to "correct" any oiling deficiency, or maybe it is. This method is done so you can use LA heads on a Magnum block that is not drilled for LA shaft oiling coming off the cam journals. There is NO oil going to the shaft in this Magnum/LA case and you have to use oil through pushrods/rockers and hope that the rockers will provide oil to the shaft. The modification shown bypasses the pushrod oiling requirement and allows use of standard LA rockers that oil through the shaft. With a standard LA block/LA head setup, there is no reason to do this external feed modification, other than you want to.