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I have a Sun distributor machine. When I first got it I thought I wasn't using it properly or that there was something wrong with it. The timing would reach full advance at whatever rpm and then at high rpm it would loose a few degrees at max rpm. Talking with other distributor machine owners, they have found the same trends. I'd still like to hear a explanation for why this happens. You would think centrifugal forces wouldn't allow it

That said I don't think I have ever seen 10 degrees only a few.



I own a marquet dist machine and i always see a high end retard on dists also, have never figured out why. As far as box I have no idea if they retard. Sorry to high jack.

1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....