Advocate III
.I’ve been here before as well. Drilling and tapping was my plan “Y”... plan “Z” was to remove the intake manifold and hope no more bolts broke... I’m hoping and praying that I have the water leak and over heating problems fixed now.
You, and others who are messing with frozen/stuck bolts and end up with snapped bolts at times, may find this vid helpful:
.
I've used the technique on stuck parts and can vouch for it's effectiveness.
.