Topic: Q-Jet vac port
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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Charlie,
On my '68 (which has a '69 7029207 Q-Jet) that port has a short piece of rubber that connects to the steel vacuum advance line that goes to the distributor.
Anthony
On my 72 carb (7042202 Q-Jet) this port has a vacuum line that goes to the vacuum storage tank, which is under the vacuum booster of the brake master cylinder. FYI. On the passenger side of the carb, next to the choke vacuum dashpot. That port connects to my distributer vacuum advance.
Hope this helps.
Hope this helps.
(click to see a larger image)
"It Takes A Little Longer To Do It Right"
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Thanks, the way mine is setup, my vacuum advance plugs into the vac port shown here with arrow. I'm confused now. I just had the carb rebuilt and it was off the car for awhile, but this is how it has always been setup. Could it have always been wrong? Vac. Line
(Large image changed to link)Adams' Apple 2007-04-08 18:22:58
(Large image changed to link)
That is the correct port for the vacuum advance.
(click to see a larger image)
"It Takes A Little Longer To Do It Right"
"It Takes A Lot Longer To Do It Again"
Lifetime MemberLanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
i know you have a bb but on my 75 the port you showed in the first pic
is where my vacuum advance goes but that is on a sb 350. should be a
vacuum diagram in the service manual.
LIFETIME MEMBER #97
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Charlie,
I think that the port shown in pic #2 is for the A.I.R. system diverter valve.
If you had the original steel vacuum line, it will line up with the port in the front of the carb (pic #1).
You can see the line in a pic from any of the major suppliers.
Anthony
[QUOTE=Ten15]Charlie,
You are absolutely correct. I was looking at a Doc Rebuild catalog and they have each year diagramed by engine size and HP. Very good diagram. So I will be getting the steel tubing and the new hoses.
Thanks for all the input guys.
Silver69 2007-04-08 19:41:28
I think that the port shown in pic #2 is for the A.I.R. system diverter valve.
If you had the original steel vacuum line, it will line up with the port in the front of the carb (pic #1).
You can see the line in a pic from any of the major suppliers.
Anthony
[/QUOTE]You are absolutely correct. I was looking at a Doc Rebuild catalog and they have each year diagramed by engine size and HP. Very good diagram. So I will be getting the steel tubing and the new hoses.
Thanks for all the input guys.
Lifetime MemberPoquoson, VA - USA
Joined: 11/20/2004
Posts: 1023
Vette(s): 73 Conv, Blue-Green/White Top - 454, M21 - Dark Saddle Leather, Power Windows, A/C, Tilt/Tele, AM/FM St. (orig. and sounds like it too).#2 -- 2007 Coupe,3 LT package, Z51 option, Victory Red, Ebony Int. Clear Top.
[QUOTE=WETVET]On my 72 carb (7042202 Q-Jet) this port has a vacuum line that goes to the vacuum storage tank, which is under the vacuum booster of the brake master cylinder. [/QUOTE]
2 cruzn 2007-04-08 20:02:56
My '73 BB goes to the same place as WETVET... to the vacuum canister.
Ooops.. too late ... good info on Dr. Rebuild...
Lifetime Member #86
USN 1966-1970
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Blue Green *** 454,4 Spd, Dark Saddle Leather, A/C, AM-FM St. (orig), PW, Tilt -Tele Wheel"
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USN 1966-1970
WestPac 67-68 Tet I&II
Featured in Corvette Enthusiast Aug 2007 "Shark Attack"
Blue Green *** 454,4 Spd, Dark Saddle Leather, A/C, AM-FM St. (orig), PW, Tilt -Tele Wheel"
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in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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