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Cure the problem, not the symptom! This is a short article taht describes the root cause and proper solution for camshafts not turning in factory Mopar blocks.

http://musclemotorsracing.com/muscle-mike-blog/82-the-real-reason-my-cam-wont-turn.html

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Mopar miss the boat on te cam tunnel finishing to the correct size

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small blocks have the same problem, had a 318 once that it happened to and the shop at the time told me to use the old cam with grooves filed into the journal and ream it to size,,I looked at the guy like he was out of his mind,I did it, it worked, but I didn't like it as it made the bearing surface rough,,the guy that does my work now fixes the problem if it occures as Mike explained and makes sure everything fit's as it is supposed to,,,,engine builders that know how to fix things right,,,,,,,priceless!