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38 total seems to work good on many BB. But you can not successfully set total advance at say 38 degrees at 2500 RPM's unless you have your distributor calibrated so that it is fully advanced at that RPM. If you were to set it at 38 degrees at that RPM with a stock distributor you would have considerably more advance left in the distributor and it will still be advance way past the designated RPM.



How do you set the dist to have total advance at a certain RPM? And how can I check my dist to determin when exactly total advance is achieved?