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Can someone identify the vacuum port that is pointed out by the arrow? Should this be plugged or does it have a hose attached. This is on a 69BB with a 4MV carb.Thanks Carb pic
(large image changed to link)Adams' Apple 2007-04-08 18:20:12
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T
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
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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.
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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
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That is the correct port for the vacuum advance.
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e
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Send PMLanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 2191
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.
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T
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
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[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.
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2
[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...
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USN 1966-1970
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Featured in Corvette Enthusiast Aug 2007 "Shark Attack"
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