Originally Posted by kwilford
Did you happen to pick up a variable timing version? With one of those, you can determine the vacuum and mechanical advance, by "dialling" the timing light to get the marks to line up, and then checking the advance you dialled in. They're a bit more expensive than the standard "fixed" timing light, but well worth it when you are trying to determine the mechanical advance at various rpm's or at throttle settings caused by the vacuum advance.
JM2CW
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Yep - I swung by Canadian Tire and picked up the best one they had - digital, tach, advance retard etc. I'll have a look at it tonight.