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In pic #2 I see rust on other components ahead of the dizzy (neck to the expansion tank, etc.). I think there is something else here going on that is leading to excessive moisture beyond just the cap.
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The other rust is local to those parts and lots of miles. MSD said the dist problem was due to an unvented cap and sent me a new center shaft and vented cap. These started to rust within a few weeks as can be seen in pic #1 with the cut away cap installed. They blame it on the MSD 6AL box with the hall effect ignition. They say it creates a large amount of Ozone that can't be vented through their vented cap. This is why they suggested that I drill additional holes in the cap. I think that the problem is made worse from the rotor being lower than the perimeter posts, seen in the cutaway. Does anybody else have dist shaft rusting problems?