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Old 05-19-2005, 02:15 PM
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Identifying Quadrajet Ports on throttle body...

Can anyone please identify these 3 ports on my quadrajet?
The qjet is off of a 1972 cutlass with a 350, and had a charcoal canister.
I had them just plugged off before but i need a port for timing, and i need to know the correct way to deal with these ports on my '66 oldsmobile. It has a vented tank with no canister.
Thank you,
Mark
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Old 05-19-2005, 02:21 PM
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Info is in the Knowledge Base.
http://hotrodders.com/kb/engine/arti...tml#carburetor
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Old 05-19-2005, 02:23 PM
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Under what topic is the answer in please? I can't seem to find it. I've read through my Doug Roe book 40 times and I cant find anything that can help identify those ports either...
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Old 05-19-2005, 02:33 PM
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1Bad,

A lot of those links don't work anymore.



I'd say #1 was ported vacuum and #2 was manifold vacuum. No idea about #3.
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Old 05-19-2005, 02:38 PM
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The ported one will NOT have vacuum at idle. Correct on #2.
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Old 05-19-2005, 02:41 PM
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Is it possible #3 is the purge for the canister? Seems to me those bottom two are awfully large ports to be vacuum for vacuume advance unless they're intended to be tee'd for other stuff?
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Old 05-19-2005, 05:05 PM
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#3 is the ported vac... The others are manifold vac...
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Old 05-19-2005, 05:57 PM
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You sure? Where is the cannister purge then?
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Old 05-19-2005, 08:52 PM
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That's definetly a BOP Q-jet, I use #3 on my Q-jet for vac. advance, It's manifold vac on mine, Mabye BOP's are diff.

Plug 1 & 2.
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Old 05-19-2005, 08:58 PM
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Quote:
'66 oldsmobile. It has a vented tank with no canister

You answered your own question...? (plug`em)

again #3 is your ported vac for the vac advance...
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Old 05-19-2005, 09:19 PM
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Kay thanks everyone it is all settled
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Old 05-19-2005, 09:27 PM
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On my Q-jet, I plug the vac. timing can into port #3 and the timing advances at idle.

again
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