Savable.. You need a TCT burr grinder bit on an air powered die grinder. Clean out out like a dentist cleans out a cavity. The studs need drilling out and retapped or helicoiled.
As long as the head can hold the exhausts in place while you tighten the stud nuts, you're all good. It will be sealed.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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