First of all, if you have never used one before, as you already figured out a head bolt hole in an engine block is not the place to learn how to do it. There is a special tool to screw the insert in with, did you use it? They screw them in from the bottom instead of the top and they go in a lot easier. I would never use a heli-coil on a head bolt. There are thread inserts that are much heavier and better suited for that application. Only problem with them is they are thicker and sometimes there is not enough clearance for them. If you screwed up the new threads enough that another heli-coil won"t go in then you are limited to three options. Go with the next bigger bolt or use a thread insert that is for the bolt you have. The last resort is have the hole welded and redrilled. The thread inserts also have their own special installation tools you would need to buy if you go that route.
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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