I had to replace my auxilary air regulator valve on my 84' that bolts to the
head and both bolts broke off.  I couldn't get them out in any way and I
tried to rethread the holes but nothing worked.  I am curious if I could
just drill through the whole head there to hold the valve down with a bolt
nut combo, or is that a bad idea?  I'm just not sure how close that is to
the cooling system piping inside there.  Right now I just have it cable tied
to some cooling pipes in the area and since the valve works off of the heat
of the engine after the initial warm up time it isn't working exactly right
especially now in this frigid weather in Wisconsin.