PB blaster or ATF and acetone.
soak and tap on them for a good while, leave over night.
Aluminium is soft and galls easily jaming them, worse than
stainless steel. When you put them in use a good anti-seize
and you won’t have this problem.
Tapping on the heads creates vibrations that pull the
soaking fluid into the joints of the threads, don’t be
in a hurry, work, then let sit, spray and repeat, leave
over night if you can. Trying to drill them and use an
ez-out may be the last resort but be sure to use the
correct size of drill and EZ-out. Good luck.
Make sure your allen wrench is the correct one and a
good solid fit. Tap on the wrench as you try turning it
too.
Any idea where I can purchase those? Auto parts store?
“PB blaster or ATF and acetone.
soak and tap on them for a good while, leave over night.
Aluminium is soft and galls easily jaming them, worse than
stainless steel. When you put them in use a good anti-seize
and you won’t have this problem.”
In my over 50 years of wrenching, these two are the very best. First try PB Blaster - made specifically (unlike WD-40) to break loose frozen things. If that doesn’t work, a 50/50 mix of ATF and acetone (mix & let set for a few, then mix again before applying).
These work especially well on frozen pistons in engines........