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Username Post: Vacuum Advance- how is it supposed to work?
Valued Contributor
Posts 3368
04-05-10 05:24 PM - Post#1893473    

NOPE, one thing not confirmed, LIMIT THE AMOUNT OF PULL PIN TRAVEL ON THE VACUUM ADVANCE, or, there will be way too much vacuum advance timing when it is plugged into full manifold vacuum.

For a 383, 8 crankshaft degrees is all needed to supplement the initial timing, and that is limiting the pull pin to .086 of an inch travel.

If anyone wants pictures of a stop YOU can make at home, and how to measure the stop distance, send me an e/mail. Let me know which type of distributor you have, large cap HEI, or small cap points type, ask for the vacuum advance stop pics, and they will come to you at no charge, no obligation. Use this e/mail address:

And, the whole timing and vacuum advance dissertation above, "TIMING AND VACUUM ADVANCE 101", came from a former GM development engineer, another person who also posts here, but did not add to this topic.

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