I have my 5.3 on an engine stand and I am going thru it, changing seals and what not. I bought this engine used from someone and it had a broken exhaust manifold bolt on the drivers rear. I removed all the other bolt after having them soak in PB blaster. I soaked this broken bolt as well. I drilled the middle of the bolt perfectly to install an extractor bit. Unfortunately the drill bit broke inside !! Its a Craftsman #1 carbon alloy extractor bit with reverse blades. I should have made the hole larger and put in a larger bit but now how can I take care of this? I have tried a cobalt and a titanium drill bit with no results. I assume I will have to rethread the hole or heli coil it if I can get the old bolt out. I was even thinking of making a custom bracket to bolt on the rear of the head (Pics below). My last option would be to remove the head and take it to a machine shop. I read on the net that I can use a carbide drill bit ? Any info would be appreciated even if it a backyard fix that some knows about !! Please help !!
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