Threaded plugs in 360la block?

That big plug with the Chinese size is so tight I can’t get it out. I cut down a 3/8 extension and shaped it with an angle grinder, even with that and a torch it wouldn’t move.

What I ended up doing (with the intake out) was getting the plug by the distributor drive in with my hands. You can then tighten it through the distributor hole with an allen wrench.

I used comp air and some soapy water on the backside to make sure that big plug wouldn’t leak under pressure.

Not sure why it’s locked up in there, I’ll worry about it if I ever have to rebuild again