Re: late flathead oiling?
Need to be sure you understand how this works and you have it correctly, a mistake will lead to a new rebuild! It is my understanding that this OEM arrangement did not have the horizonal passageway threaded, they used a special vertical fitting and an external valve arrangement. The ball and spring is a relief valve if there is an obstruction in the filter itself. The modern modification (often referred to as a 95% filtration) involves tapping the horizonal passage and installing a grub to block oil flow. This setup does not have a by-pass valve except for one within the filter itself.
Sounds like that is where you installed the 7/16 grub, just interesting how the threads got there in the first place and why you would need to sand the threads down.
Last edited by JSeery; 11-04-2019 at 06:30 PM.
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