Re: Vacuum advance dist. for Model A
#3 cylinder on old VWs ran 3 degrees of retard. That cylinder was shrouded by the oil cooler and they retarded the spark to keep it a little cooler. The Porsche 356/912 distributors had evenly spaced distributor cams.
The air cooled VW used a clockwise rotation distributor and the Model A is CCW.
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