My 422 smallblock build

SSG_Karg said

Yeah the tubed side. I’ll look at possibly tapping the hole but the feed from the #1 main is only 1/4” into the whole. I think a pipe plug would either block the feed or stick out the face too far. Suppose I could grind it down except I broke my bench vise last week and haven’t made it to Harbor Freight yet.lol!

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I tap this for a 1/2 pipe plug. Test fit the plug to see its position when tight.
On the outside of the plug scribe a line that’s inline with the number one oil passage.
Then I grind a notch on the opposite side of the scribed line.
When you install the plug, the scribed line
Will indicate to you where the position on the notch is, to be sure your notch is lined up with the oil feed passage.
I seal that pipe plug with loctite to seal it against leakage and to be sure it doesn’t move.