How do I set distributor adjustable vacuum can advance?
My engine is roller cam 383ci and my manifold vacuum at idle is 12.5HG, with initial mechanical timing of 17* @900RPM and 35* all in @ 2900RPM
I am going to plug my vacuum can directly to manifold vacuum (12.5HG), but am unsure of how to set my vacuum can.
Here is a link to the instruction sheet, but I am little confused with the chart.
Can you help me please?
http://www.street-fire.com/8362.pdf
Bottom line is you want 36 degrees between 2500-3000 and a total of 52 degrees.
If you clikc on the "Other" in the red banner above and go into the Tech Tips for C3s, there are timing papers in there that explain it better than I can. Good luck with your car.








