How to Identify the difference between distributor caps

[halifaxhops]

halifaxhops submitted a new Article:

How to Identify the difference between distributor caps

I get asked all the time how come my distributor cap will nor fit. There are two types one for the common aluminum case distributor that fit both point and electronic units then there is the dualpoint cap that fits only the cast iron distributor housings. The aluminum has a internal slot that...

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[Jim McLain]

Here's a grade school question for you. How do you know which point on the distributor cap corresponds to #1? Is the position of #1 based on the location of the vacuum advance or the tab located near it? And do the tabs advance CW or CCW?

Thanks, Jim