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Had the same problem on a gen6 502 with crane roller cams with the cast dist. gears. My prob was it would wear out 2 or 3 teeth on the dist gear(cast MSD gears). I never let it fail and the other motor never had an issue.
Turned out to be the cam, I couldnt see the cam gear in the engine, but after pulling it out it did have a wear issue on the cam gear. New cam and dist gear, both looked new after 80hrs.
LE
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