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Old 11-08-2012, 09:16 PM   #14
70STOVEBOLT
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Join Date: Jun 2005
Location: Winona Lake, IN
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Re: 250 HEI Timing, vacuum advance question

From everything I've read, inline sixes don't like a lot of initial advance. That is an A on the timing tab not a 4, stands for "Advance". If you connect a timing light and watch as you turn the distributor counter clockwise you will see the mark move toward the A. I don't know the range of my vac advance, but it is the stock distributor with a Pertronix Ignitor.
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