Removing the oil galley plug for Indy heads

The Indy heads require the external oiling lines that require you to use both of the oil holes at the rear of the block. The plugs have always been hard for me to remove, but for some reason, this time it's especially tough to get out. I don't want to strip it out trying too hard with an Allen wrench.
How have you guys done it?
Thanks in advance for any help.

Try using a hair dryer and warm the head up around the plug up for several minutes or more and then try it, make sure it gets hot to the touch first, not just warm

after that melt some candle wax or blaster on them and wait a bit then try removing them.