Tried it again....this time with permatex around the plug before I put it in. Let it set up for 24 hours, then smeared some silicone around the edge of the plug where it meets the block. Let that sit another 24 before starting. Still leaks.
My concern here is that it seems there is a sleeve in the block that this plug goes into so I'm not confident in tapping this properly without leaving metal shavings. The hole in the block that presumably leads from this galley back to the pan is almost directly behind this plug so the shavings make me nervous. I will do it if I have to but would rather try the plug more time.
Any other advice?
Thanks All