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Timing, what rpm?

I Use stroboscopic at my normal idle speed ,engine warm, dwell time set to specification..
 
Dwell time is the inverse of point setting

Normal idle speed also varies by car . I am referring to what is shown on the car tach,mine shows 1000 RPM But my accurate hand held says 800 RPM.
 
AUSMHLY, Here's the page from the Bentley Manual for the Big Healey. I believe that the centrifigal advance starts to come into play just at or a tecsh beyond 600 rpms. So if your setting the timing at whatever at an rpm above 600 you are allowing the centrifigal to do some of the base/initial set point. If then you were to slow the rpms down to 600 you would find that your base/initial is alittle lower that what you set it at. Unless you are racing that isn't going to affect you to much. As a matter of fact, at the lower base setting at 600 rpms it will go a long way to keep your engine from pinging or running on after shut-off. But I generally have my timing anywhere from 10 to 15 degrees BTDC at around 800 rpms. Here's the page:
 

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