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Discussion Starter · #1 ·
Hello everyone
I have an old GM vacuum can and no vacuum gauge to check its specs. Does anyone know what the 319 breaks out to? I know it will pull 18 degrees but dont know when the unit will start pulling in inches of vacuum.
Thanks in advance

Eddy
 

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Discussion Starter · #3 · (Edited)
Pat
It is an HEI advance, sorry for not stating that. I had a second person believe that it was 319 18 also. I was led to believe that the older GM HEI units had a three digit number and then the total number of degrees the can offered. I will check again tonight to see if it is a B..Just checked and it is 319 18. I am going to find a friend that has a vacuum pump that I can check the specs again. I guess initial oull and then how much vacuum to pull all the timing in.
Thanks again
Eddy
 
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