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02-15-2010, 12:04 PM
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#1 |
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PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Ported vs. non ported vacuum?
Can someone explain that? I have a stock rochester quadra-jet on my truck and for my HEI dist. i need PORTED vacuum. How the heck can i tell if its ported or non ported?
Whats the definition of manifold vacuum.. Basically just like it sounds im sure.
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New project. 1971 Twin Turbo blazer http://67-72chevytrucks.com/vboard/s...d.php?t=676047 My new YOUTUBE channel.. Videos of my truck and a current walk around. Lyrikz74 Youtube channel DONE! SOLD!  My 1971 stepside build thread My Build Thread UPDATED 6/11. DONE and sold. |
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02-15-2010, 12:31 PM
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#2 |
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Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Ported vs. non ported vacuum?
Start it up and throw a vacuum gauge on it. A manifold vacuum source, (non-ported), will have vacuum at idle. Ported won't have vacuum at idle.
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Beat it to fit, Paint it to match... 
Last edited by Sinister; 02-15-2010 at 12:32 PM. |
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02-15-2010, 01:36 PM
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#3 |
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Registered User
 
Join Date: Oct 2008
Location: Everett, WA
Posts: 326
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Re: Ported vs. non ported vacuum?
The basic concept is there’s no vacuum at idle to the distributor and can be checked with a vacuum gauge with the engine at idle. The picture below shows the port on a Q-jet
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