Flathead oil gallery

[Lynn Eades]

Hi Mariano. If you have nothing connected to your engine block (apart from an oil gauge) then you must remove that plug. It interrupts (stops) any flow from your oil pump to your bearings. It MUST be removed. You also have to make sure there is no loctite or sealant bits left in there to damage your bearings. If you have a bypass oil filter connected, you still remove it. Your first picture only applies to a FULL FLOW filter. In that case, the plug stays in. Be careful to understand what happens.
Thankfully your English is very good. If you spoke one word in your native language, I cannot understand.
Ask whatever questions you want to ask. I can only offer advise. I am trying to be clear.
The responsibility for what happens is on your shoulders. If you were next door, I would come over and help, but that cannot happen.

Ideally the grub screw / gallery issue should be decided while the block is bare (completely stripped)