Point gap affects dwell angle but doesn't equal dwell angle.
Generally dwell shows up about 50% duty cycle and the angle depends on the number of cam lobes. On those distributors made for easy gap adjustment while running, a dwell meter works. All the Delco gas tractor distributors I've seen don't work that way but you have to set the gap with the cap off the distributor and it can't run that way.
When setting the gap (on a cam lobe top), there is usually some specification (.022 for the two I own) and increasing the gap decreases the dwell.
After you set the gap/dwell you have to set the timing because changing the gap changes the timing.
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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