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Old 03-06-2015, 03:43 PM   #1
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68 289 timing question

So I'm trying to set the timing on my 68 289. My question is it necessary to remove the vacuum line from the distributor while lining up the mark with a timing light? And if so, why?


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Old 03-06-2015, 04:02 PM   #2
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Yes. You are trying to set initial timing. The distributor uses the vac signal to advance the timing when you hit the gas. This screws up your reading. You probably have to plug the hole so you will still be able to idle with the hose off.
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Old 03-06-2015, 04:13 PM   #3
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Quote:
Originally Posted by ER12883 View Post
Yes. You are trying to set initial timing. The distributor uses the vac signal to advance the timing when you hit the gas. This screws up your reading. You probably have to plug the hole so you will still be able to idle with the hose off.

Thanks, there are 2 vacuum connections on the distributor , the hose that is connected now is on the connection nearest the radiator, the other connection is open. Does that sound correct? What's the other connection for ? Retardation of the timing?


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Old 03-06-2015, 08:04 PM   #4
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Post a pic. Not sure why there are 2. It's only to advance the timing as already mentioned.
There should not be any open vacuum connections.


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Old 03-06-2015, 08:40 PM   #5
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Originally Posted by Aggiesrok View Post
Post a pic. Not sure why there are 2. It's only to advance the timing as already mentioned.
There should not be any open vacuum connections.


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Yeah I agree. With it running, you can put your finger on it to see if there is vac. Is it aftermarket distro/who makes it?
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Old 03-06-2015, 09:29 PM   #6
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Click image for larger version

Name:	ImageUploadedByMustang Evolution1425698887.695067.jpg
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ID:	176860 is factory distributor as far as I know


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Old 03-06-2015, 11:14 PM   #7
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That distributor is from a 70-72 F-series truck. The vacuum pot not only advances the timing but will ****** it as well. That one nipple that is disconnected is the one that retards the timing, so it is connected correctly for your application.
I recommend replacing the vacuum advance on that distributor to one that has a single vacuum line that only advances the timing.
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