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Here's my take. I don't think the one broken bolt is causing your leak. As I wrote the other day, I have the same Canton pan and it leaked down the side rails/flanges at rpm above 2000 or so. The flanges were not straight. After putting a straight edge (square) to it I saw the non-flat condition of the pan. The pan came like this from the factory. Just do some tweaking and hammer the holes down so the straight edge shows no more than .020 gap. Plug up the hole from the broken bolt with silicone. I've had broken pan bolts before without leakage. Pulling the engine for one broken bolt shouldn't be necessary.
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