You are fixing to find out you are in worse shape now than when you had a broken bolt. A regular drill bit is not gona drill out a easy out.
In my book you have 2 choices short of taking the head to a machine shop.
Make a drill guide out of a flat piece of steel. Drill holes so you can bolt it to the head using the other exhaust bolt holes; and center a small 3/16 inch hole over the broken bolt. Get a "Rescue Bit" (google the name) and use the drill guide to drill down the center of the easy out. Once you have it drilled you can remove the guide and use the rescue bit to chip out more if needed. This still leaves you with the broken off bolt in the hole so you still have the tedious work of getting it out.
If you have access to a welder you can get a special rod called "Stud Pull" by Duratrode. It has a special flux on the rod that allows the weld to stick to the broken off bolt but not the head. So I do not have to type out all the details follow the link to a post about it a few months ago.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
... [Read Article]
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