Header studs snapped off after i did a bad

So, i live in Florida, Florida gets very very hot during the summer, rookie mistake, please flame me, but i thermal shocked my header bolts because they were smoking hot with a gas station bottle of water. Now the studs broke off, how should i go about getting them out, or will i have to drill them out, thanks in advance!! (I will be replacing the crush washer as well.)

 

Looks like you will have to drill them. Start with a small drill and go slow. Once you get a small straight starter hole you can use a larger drill, just large enought to get an ezout in. Before starting with the ez-out, i would soak it with Kroll or something similiar.

 

Centre punch them if you can. I used MAP gas on a seized stud on my engine.

 

Alternatively, if you have access to a welder, you could try welding a nut on the end of them. The heat will break them loose, and then you can use an actual wrench/ratchet.

 

This sounds like a good way out.
My experience with Ezy outs is that they barely work with sheared clean bolts, not so much on anything small and tight.

 

I drilled mine out and it was a difficult job. Were I to need to do it again, I would try the weld method first. A lot of how to's on youtube.

 

Steel m6 in old aluminium is not likely to be easy to remove - hence the "easy out" is likely to be anything but..
I had the three sidecover screws on my 650 shear off, all of them had enough left sticking out to weld a nut to, which I did. Despite the heat and repeated tapping with a small hammer each one snapped off again, and again. Until there was nothing left to weld to.
So the only answer was to centre punch and drill, carefully, going up in sizes. Then use a left hand thread m5 tap to remove the remains of m6 thread. They all came out clean.
I'm not saying this is the only way, but its likely the only way to get back to original, without installing a thread insert.
Going up to m8 is a bodge imho...

 

Make sure you have fresh good quality drill bits , preferably use new on each stud . Granger sells good quality bits .