Valve Cover sealing problem with a stripped out bolt hole

Treblig said
You said that there was tool steel down in the bottom of the hole. How thick/big is it. The reason I ask is that I'm a machinist and have had to deal with these problems before. Tool steel is brittle and it will break if you smack it with a dull punch and hammer. If we ever had a broken drill bit or even a carbide drill bit broken off in a hole we would use a dull punch and a hammer and bust it out of there. But it depends on how thick/big the piece is??

yep...it was a piece of an extractor....

the good news is that I put some more hate into it, used a small punch, then worked a burr some more into the broken extractor, then put my shop vac on it and had a geyeser. I guess the previous hack drilled all the way thru the bolt into the water jacket.

At this point I think I'm better off as I can heli coil it or time sert it now that the hole is obstruction free. All it took was a little more hate.

Valve Cover Bolt Hole Problem 02.jpg