Cliff's Quadrajet Parts and Rebuild Kits
Quadrajet Problem Solving => Quadrajet Parts and Numbers => Topic started by: Joey85 on May 04, 2015, 08:32:02 AM
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I was woundering what the factory specs is for 2 quadrajets
Also which one would be beter to rebuild for modifid 350.
17057202
17057253
Thanks
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I was woundering what the factory specs is for 2 quadrajets
Also which one would be beter to rebuild for modifid 350.
17057202
17057253
Thanks
17057202- .077" Primary Jets, 52K Primary Metering Rods, "K" Secondary Hanger and CH Secondary Metering Rods.
17057253- .073" Primary Jets, 49K Primary Metering Rods, "K" Secondary Hanger and CV Secondary Metering Rods.
Either one sounds like a good candidate. Cliff would be best to answer. Just make sure you give the specs of your vehicle. Cam, engine, transmission, rear gears, etc.
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Thank you Ethan1
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Thank you Ethan1
8)
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Those carburetors are basically equal from a performance standpoint. I'd probably use the Chevy carb or at least put a short fuel filter housing on the Old's carb if it were used.
The end result from each would be the same, and both will need recalibrated for a "modified" 350 cid engine.
I would recommend converting to E-choke, HP quick release pull-off, idle system set up for the engine parameters, one of our rebuild kits, correct PP spring, and tuning components.......Cliff
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Hi Ethan , could you please tell me the original internal specs (jets , hanger and rods) for this carby ; 7042270 .
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Hi Ethan , could you please tell me the original internal specs (jets , hanger and rods) for this carby ; 7042270 .
Stocks specs were .071" Primary Jets, 45 Primary Metering Rods, "K" Secondary Hanger and CR Secondary Metering Rods.
Welcome to CHP, by the way! :)
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Thanks very much Ethan1 , you are correct . Do you get your information from a book ? If so can I buy a copy ? Are there any changes you would make (normal street driving) to this (7042270) carby to run on modern fuel ?
Thanks , Tim . (Australia)
Also thanks to Cliff for introducing me to this site .
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Can I have the internal original specs for these carbs please ;
7041270
7043270
7042240
7043240
7043262
7043266
Thanks , Tim .
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Can I have the internal original specs for these carbs please ;
7041270
7043270
7042240
7043240
7043262
7043266
Thanks , Tim .
7041270- .074" Primary Jets, 43 Primary Metering Rods, "K" Secondary Hanger and BP Secondary Metering Rods.
7043270- .076" Primary Jets, 41 Primary Metering Rods, "K" Secondary Hanger and BV Secondary Metering Rods.
7042240- .073" Primary Jets, 48B Primary Metering Rods, "K" Secondary Hanger and CT Secondary Metering Rods.
7043240- .073" Primary Jets, 44B Primary Metering Rods, "K" Secondary Hanger and CT Secondary Metering Rods.
7043262- .071" Primary Jets, 41 Primary Metering Rods, "K" Secondary Hanger and CR Secondary Metering Rods.
7043266- .072" Primary Jets, 47C Primary Metering Rods, "K" Secondary Hanger and DB Secondary Metering Rods.
Keep in mind, there were variations. Not all had the same specs. Just the way it was back then. :)
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Thanks Ethan1 . Next question , what was the carb number for the 1970 Pontiac 455 (H.O. 370hp) , and what were the internal specs ?
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Thanks Ethan1 . Next question , what was the carb number for the 1970 Pontiac 455 (H.O. 370hp) , and what were the internal specs ?
Automatic or Manual? California legal or non?
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Automatic and Federal ( 70402?? ) .
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Automatic and Federal ( 70402?? ) .
7040268. .071" Primary Jets, 41 Primary Metering Rods, "K" Secondary Hanger and CC Secondary Metering Rods.
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So there was no 7040270 carb in 1970 ?
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So there was no 7040270 carb in 1970 ?
What model Pontiac are we talking about here? I am assuming the GTO?
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So there was no 7040270 carb in 1970 ?
You would be correct. I went right past it. The 7040270 is the correct Qjet for the Ram Air IV.
.070" Primary Jets, 39 Primary Metering Rods, "K" Secondary Hanger and CC Secondary Metering Rods.
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Yes Ethan1 your right , the 7040268 was for the 455H.O. and the 7040270 was for the 400RA IV . Could you take a look at the front cover of Cliff's book and tell me what you think the carb is ? I think it's of a Buick GSX 455 Stage 1 . What numbers were used on those carbs and what were the internal specs ? How much different were they from the standard Buick 455 carb (auto) ? Was the Stage 1 option only available for 1970 , 1971 & 1972 ?
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Yes Ethan1 your right , the 7040268 was for the 455H.O. and the 7040270 was for the 400RA IV . Could you take a look at the front cover of Cliff's book and tell me what you think the carb is ? I think it's of a Buick GSX 455 Stage 1 . What numbers were used on those carbs and what were the internal specs ? How much different were they from the standard Buick 455 carb (auto) ? Was the Stage 1 option only available for 1970 , 1971 & 1972 ?
Not sure on the front cover Qjet. Cliff would be best to answer.
The option for the Stage 1 went from 1969-74.
Which year are you interested in?
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1971 and 1972 .
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1971 and 1972 .
1971 was the 7041242: .075" Primary Jets, 45B Secondary Metering Rods, "K" Secondary Hanger and AV Secondary Metering Rods.
1972 was the 7042242: .075" Primary Jets, 47B Secondary Metering Rods, "K" Secondary Hanger and CV Secondary Metering Rods.
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Sorry Ethan1 , I forgot to ask for 1970 as well .
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Sorry Ethan1 , I forgot to ask for 1970 as well .
1970 was the 7040246: .068" Primary Jets, 42B Primary Metering Rods, "K" Secondary Hanger and AU Secondary Metering Rods.
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Does anybody know what the carb is on the front cover of Cliff's book ?
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It took a lot of research but I got it . The carb in the picture on the front cover of Cliff"s book is a model 7029273 .
1969 Ram Air IV 400 "Judge" for manual transmission .