I just did a closer inspection and felt a small amount of air coming out of the water jacket at the top of the block.
So I don't have to scrap it I drove the expansion plug in the end of the galley deeper into the galley so it would take the feed out of the circuit.
Then installed two more plugs on top of that.
Now there is no way for oil to get up the whole I drilled from mains as it is set screwed and sealed.
No way for water or oil to get to and fro from the galley to water jacket because I have a soft plug on each side.
I'll get a video up tomorrow and explain it better.
Off to work.
Bummer, one lackadaisical move and block could have been trashed.