[348chevy]

I have two small bolts broken off in an engine block. There are no threads showing and the bold is too small for a bolt extractor. I thought about drilling and taping the hole, but it close to the exhaust and I don't want the drill bit walking over into the exhaust. If you have any suggestions let me know. Thanks!

[302 Z28]

If the bolts are not grade 8 then you should be able to center punch them and drill them out a little for a screw extractor. Do not use the screw extractors that look like a reverse screw thread. Use the screw extractors that have reverse verticle ribs, it is a much better extractor.

Vince

[CurtisLr]

I've had good results using a reverse twist drill close to the size of the broken bolt. Bought a set a NAPA. Just try to startas close to center as possible. The heat and reverse twist usually brings the bolt out onthe drill.
Larry

[302 Z28]

I have found the reverse screw extractors are of inferior metal and if the broken screw is in fairly tight they will snap off. I had one I purchased from NAPA that broke when I was trying to extract a broken brake bleeder screw. I was able to drill it out then use the other type of screw extractor.

Vince

[chevy lovin]

reverse droll bit .its worked for a million times.

[jim..]

Using a nut one size bigger than the bolt,position the nut over the broken end,and using stainless or extraction rod,weld thru the hole in the nut to the bolt untill they are welded together,let cool a bit and put a socket on the nut and turn it out,the heat from welding will help free the stuck bolt,I do it all the time.

[302 Z28]

Originally Posted by jim..

Using a nut one size bigger than the bolt,position the nut over the broken end,and using stainless or extraction rod,weld thru the hole in the nut to the bolt untill they are welded together,let cool a bit and put a socket on the nut and turn it out,the heat from welding will help free the stuck bolt,I do it all the time.

That will work great, if you have some bolt sticking out of the threaded hole.

Vince