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Disconnect the vacume lines. If your centrifcal (sp) advance is working, when you rev the motor the timing will advance. So all you do is hook up a timing light and note the advance from idle to 4000 rpm and plot it on a graph and compare to the factory graph. If it advances too fast put stiffer springs in and recheck. If it advances too slow put weaker springs in.
Dean
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Dean
911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
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