i have an exhaust stud thats broken off inside my block. I wanna get it out cause its leaking pretty bad. whats the best way to try and get it out without damaging the threads?? I tried ez-out but it didnt do anything. any ideas???

 

If the easy out didnt work, the only way is to drill the entire thing out and retap the hole. They're a pita, no doubt about it. I welded a nut onto the end of the stud once too. It worked, but might not for you if the stud is too seized in the head.

 

You could try using a small left-hand drill bit and then work up to bigger left-hand drill bits, you might get lucky and get it to back out without having to drill it all the way out and tap it. Take your time to get the first hole straight, you won't regret it, start your hole by denting the middle stud with a sharp center punch. Also, on your first hole make sure you drill all the way through the stud, it does helps relieve the pressure on the threads. After you drill your first hole put a little heat to it and try an extractor (I have better luck with the square ones than with the swirly ones). I usually extract 2-5 broken bolts every week, the slower I approach it the faster I get the bolt out. It sounds like the stud is broken in the block, if it didn't break off flat first drill it with the biggest drill bit you can fit in the hole, that will allow you to center your smaller drill bit on the stud. And yeah, if you can reach it to weld a nut on it I would definitely go that route. Good luck.

And remember: Safety glasses are worth there weight in eyeballs.

 

before you drill anything, did you try heating it up, and give it a good whack with a small hammer a few times? I work on a lot of old machinery, and it works almost every time. "60% of the time, it works every time" (Anchor Man) Ha ha