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Hi Gene,
Back in 69, Porsche decided to run a rocker that had no bushings. The shafts and the rocker would transfer material resulting in a shaft that could not be removed from the cam towers without damaging the bores. If the bores are indeed damaged you may require a good set cam towers to resolve the issue. Based on the overtightening compaint they are probably not in good condition.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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