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So the good news is the SV is fully disassembled and ready for the new frame.
Bad news is both the header bolts broke in half.
The sort of good news is there's a good 1/4-1/2" exposed and the motor is out and pipes are off so I can get to them easily.
I hear it's a common issue but a lot of people recommend drilling and using a bolt extractor. Sounds like a lot of people end up wrecking the bolt and getting a helicoil in the end this way. NOT keen on putting a coil on a perfectly good head. Seeing as how the bolts were tight enough to break in half even after a few days of PB soaking I feel like a bolt extractor is going to be useless and end up just wrecking the bolts trying to drill.
Getting to the point: I want to weld a nut on both bolts. But I'm worried about wrecking the aluminum. I have a basic 125A wire feed HF welder. Anyone with experience in this kind of thing? Where would I put my ground clamp? What are the chances of overheating/warping the aluminum?