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Old 12-09-2011, 09:34 PM
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I always lay down the money for an adjustble vacuum advance b/c most factory cans add up to 25 degrees extra timing, which is too much for me. However it is just one little detail that could probably wait, especially if you are happy with the way the car runs already. There are definitely things more fun to spend your money on, and there is no guarantee that you will notice much of a difference anyway. If you have a good digital timing light that shows rpm, or have a friend that has one you can borrow, and you find that you are close to about 35 degrees total timing, all in by about 2500 rpm; You can't really improve on that much. I usually like to set my initial timing 12-14 degrees btdc. You can pick up a spring set for a couple bucks and put one lighter spring on the mechanical advance. That might be enough to get you there too.
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