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01-09-2007, 09:07 PM | #1 |
PROJECT 7DEUCE
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
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Need some quadrajet help...
Can anyone tell me what this little vaccum looking thing is for and do I need to run a vaccum line to it??? Any help would be great.... btw I have not ran this carb before..... Just need some help before I fire it up..
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GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
01-09-2007, 09:39 PM | #2 |
Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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Re: Need some quadrajet help...
Lance, What is the carb number. If that is on the right side of the carb on the forward end it is probably the vacuum break assembly (choke pull-off). It is hard to see from the pictures...but maybe that is my computer screen.
On further review...I reserve judgement as to it's EXACT method of function during the start or run cycle...LOL! Hook it up to a vacuum line for certain. The spec. on it should be 10-12 inches of vaccum will hold the choke open...if it leaks down it will need to be replaced.
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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) Last edited by stllookn; 01-09-2007 at 09:49 PM. |
01-09-2007, 09:46 PM | #3 |
laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,514
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Re: Need some quadrajet help...
No, it's not just your puter screen. We've got a serious blurrrrrrrrr goin on here.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
01-09-2007, 10:05 PM | #4 |
PROJECT 7DEUCE
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
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Re: Need some quadrajet help...
Still have not figured out the new camera..... I can get the carb # wensday as the truck is not at my house right now...
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GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
01-09-2007, 10:06 PM | #5 |
PROJECT 7DEUCE
Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,606
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Re: Need some quadrajet help...
I dont run a choke on this truck,was wondering if it had something to do with the secondaries..
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GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
01-09-2007, 10:13 PM | #6 |
laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,514
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Re: Need some quadrajet help...
Very well could be. Is there a vacumn port at the rear of the carb the right size for a hose to attach this vacumn pod? Seems like my old 85s had this on them.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
01-09-2007, 10:42 PM | #7 |
Back in the sticks
Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
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Re: Need some quadrajet help...
Its on the passenger side right? If so, it is the secondaries. Vacuum line goes up to one of the ports on the front I think. Can't remember now where mine plugged in...
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1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty |
01-09-2007, 11:39 PM | #8 |
In Memoriam...
Join Date: Nov 2006
Location: Wallburg, NC
Posts: 1,216
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Re: Need some quadrajet help...
I know diddly squat about Q-jets, but heres a link to Q-jet manual scanned on-line. The pic below was copied from there. Good luck...
Linky...http://www.tocmp.com/manuals/Carbs/R...QJet/index.htm
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'68 C10 SWB 307ci 2BBL FarmTruk Pics Here "You know, doing what is right is easy. The problem is knowing what is right." |
01-11-2007, 09:03 PM | #9 |
Senior Member
Join Date: Oct 2006
Location: Edmonton Alberta
Posts: 458
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Re: Need some quadrajet help...
the vacuum piece is a secondary air valve damper which will not allow the secondary air door to open under regular driving which would cause it to bog. Also slows the opening of the valve when you hit the throttle hard to prevent bog. I love these carbs
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01-11-2007, 09:12 PM | #10 |
Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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Re: Need some quadrajet help...
you got it brother..should hook up right the in the rear if the carb.
if thats on a 67-72 truck that looks like a newer vintage carb. heres a few pictures of the one i converted to electric choke the last picture shows it hooked up new to the power brake vacuum fitting in the rear Last edited by rage'nrat638; 07-12-2007 at 06:59 AM. |
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