exhaust nuts

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WEAL Norton said:
I make my own alu inserts. The old thread gets milled out of the head, the insert is made oversize and shrunk in then the outer edge gets welded to the head all around. When its all dressed up and blasted you can´t see a difference to the original thread.
Mic your exhaust nuts - they have all slight differences - that's why I make each insert suitable for the nut that should fit it...
Also check for out of round. It is very easy to put a nut out of round with a big cheater bar or hammer and punch. Try to keep the tool near the head where the nut has some strength. If you put the tool to the outside, away from the threads you can deform the nut. I used a pipe wrench with one jaw on the double fin always. If it was real tight I'd try different positions and heat.
 
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