Helicoils.
Take it to a shop. Cheap fix or call and ask if they have a deep socket!
If the actual threaded part in the head is stripped, you have to use a tap and re-thread it. to avoid metal in the cylinder bore, u should take the head apart from the block to do it. I recommend doing this yourself, as a shop will probably charge you over $1000
You will probably have to re-thread unless you can get a SLIGHTLY over sized bolt to thread and seal
That threaded nipple is removable, replace it.
You could use larger screws.
How do u fix a stripped out oil pan
wear a jacket and screw a block of wood onto the shoulder bit, then screw the parrot on to that wood
Ways to remove a stripped screw: Create a notch which you can fit a cross-cut screwdriver into using a metal file. This only works if the screw head protrudes enough to get the file into it. Drill out the head of the screw, remove the part it was holding in, and use the new angle to try and remove it. Carefully fix a rod to the screw itself (using glue) so that when you turn the rod the screw turns with it. (This runs the risk of gluing the screw in permanently unless you're good at precision).
YOU COULD USE JB WELD,ANY AUTO STORE SHOULD HAVE IT. OR YOU COULD USE A KEENSERT,THIS HAS THREADS ON THE INSIDE AND OUTSIDE.YOU WOULD HAVE TO DRILL AND TAP THE STRIPPED HOLE AND SCREW IN THE KEENSERT.THE INSIDE THREAD HAS TO BE THE SAME SIZE AS THE HOSE END, KEENSERTS ARE ALSO MADE WITH A THIN WALL, WHERE LACK OF METAL RESTRICTS THE SIZE OF THREADS. GOOD LUCK PAUL G
No way to fix that - your tank is scrap.
I would use a tap and die set to re-thread the shaft down one size.Since it's just a hold-down nut, it won't affect the functionality.