1. Aftermarket weights are generally junk. Total scrap metal. If the Pertronix stuff is different, I don't know about it. I'd rather use GM weights.
2. Weights from GM are not specific to direction of rotation. You want to use weights from one direction on a distributor that turns the other way? Flip the weights upside down. Flip the center-piece upside-down, too.
3. The way I remember it--and someone should verify, 'cause I'm old 'n' senile--is that "Chevy" has the stamped numbers facing "up", and distributors that turn backwards from Chevy have them "down".
4. 10 degrees at the crank is something lots of guys would happily take...'cause then they can run too much initial timing, about 22--25 degrees. Given a choice, I'd like to see somewhere in the 16--22 range, depending on the vehicle. Enough centrifugal to keep the initial low so as to avoid starter motor problems.
5. If this were me, I'd be looking at the size of the slot that the limit pin goes through. On Genuine GM distributors, the slot is way too huge, some guys weld them to provide a positive-stop for the advance. Perhaps Pertronix went the other way, and made the slot too small. A grinder would easily fix that.
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