Both cast iron gears? I mean, not a situation like an iron distributor gear running on a steel cam (roller or other billet cam)?
Were you running the "extra insurance" of a tiny oil hole in the plug at the back of the passenger-side lifter gallery?
Gear wear is almost unheard-of with both Pontiac gears (distributor & cam). I've always been a little suspicious that some aftermarket cams don't have a gear with exactly the same hardness that a Pontiac cam gear has.
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