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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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