You might be better off brazing the easy out to the drill rod with some good
nickel-siver rod.
I assumed that the bolt was one of the long ones and was brocken off deep. I
suspect you'll find that the bolt turns fairly easily unless there is
something else wrong. Penetrating oil usually won't really help much, the
problem isn't rust or other gunk, it's just that the bolt was highly torqued
and might have been bottomed. Yet another good reason to not bottom out head
bolts. I run them to the bottom and back out 1/4 turn.
You don't need a super long pilot, but you definitely want it to slip all
the way down to the bolt. If the pilot is touching the top of the bolt then
the drill can't wander.
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