Not Ranked
With the valve lift and spring pressure you will not get aluminum to live with a shaft that big thru it---the failure has occurred to an alum part that has had a huge static load on it over an extended period of time
I have seen numerous failures of aluminum parts where there was a threaded fastner under a high torque load over a extened static load---(rods for one thing, rockers also)seems that the failure radiates from the threaded area of the aluminum
Alum rockers should have the load relieved if sitting for extended periods
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