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Couple things:
- Mag cases do pretty much always need work, so no shocker.
- Depending on how the case distorted, it is sometimes possible to bore back to standard without any other work. It would be lucky if this is the case, but worth asking. Boring oversized leaves you buying expensive, hard to find bearings.
- If the bores have worn/distorted larger, there is an option to surface plane both halves of the case and then line bore back to standard. A lot of work.
- not sure I get the bit about the heads being closer and chains being loose. It’s common to account for this with thicker cyl base gaskets or spacers if needed. Or even different idler sprockets.
- There are only a few shops who are qualified to do this work. Hopefully you’re using one of them.
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