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Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old 07-19-2004, 09:59 PM   #1
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Car: 87 iroc
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quadrajet secondary stumble

what does it mean again, when you bog going into the secondariesfor a few seconds then it goes like hell!!! (on a quadrajet) and how do i overcome this!

kseu my primarys are tuined amazing, but once those secondaries open up, it bogs, then is gone!
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87 - iroc 350 .060 over, speed pro flat tops, block decked zero. compression shud be 10:1 .436 lift 224* @ .050 300 adv 108 l/c cs-112R cam, 3998991 casting heads, lightly ported by myself., performer intake, quadrajet right now, hedman long tubes 1 5/8 dual 2.5" 350 turbo tran , have a 4000 stall converter, 3.73 gears, old cascar slicks
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Old 07-20-2004, 08:33 AM   #2
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i asked the same question and a fellow replied that it could be vapour lock, and if you were planning on keeping the carb, what he did was fabricate his own "cool can" which cools the fuel before entering the carb thus eliminating the bog altogether.
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Old 07-20-2004, 09:48 AM   #3
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That's not vapor lock, that's the classic quadrajet bog.

http://www.thirdgen.org/newdesign/tech/quadrajet.shtml

1st topic, "Setting the Air Valve (AV) tension."
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Old 07-20-2004, 09:48 AM
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