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Yes, use the 76/44 with the stock size MAB's.....
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Quadrajet Parts and Numbers / Re: Decode -- help, please...
« Last post by Sonny on July 19, 2018, 03:24:58 PM »
Thank you, Cliff.

 I am considering a rebuild of this carb for use on the nearly-stock ‘78 SBC 350 with TH350 that I have in my ‘66 Chevy II 100 Series station wagon. The non-stock components are Edelbrock 2701 EPS Performer dual plane intake and 1406 AFB. I know I will need a spacer to mate square bore intake to spread bore carb. At this point I’m reading about the Q-jet here on your forums and in the several GM service manuals I have in hand.
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Quadrajet Carb Talk and Tips / Re: qjet for 250 inline 6
« Last post by A.G.V.chevyfreak on July 19, 2018, 09:23:47 AM »
Will first try it as it is and see from there if it needs changes and where.
thanks for your input and guidance on this.
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Quadrajet Parts and Numbers / Re: Decode -- help, please...
« Last post by Cliff Ruggles on July 19, 2018, 07:58:34 AM »
The "507" is most likely going to be the CA version of the "207" which was used on the 350hp engines with the manual transmission, not the 300hp......nice carb.....Cliff
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Diagnose a Quadrajet carburetor problem / Re: Air Valves Not Opening
« Last post by Cliff Ruggles on July 19, 2018, 07:56:35 AM »
Assuming vacuum to the pull-off was falling of to close to zero at WOT the pull-off would release and allow the secondary flaps to open, but it may take a few seconds depending on how big the restriction in the inlet to it is.......Cliff
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Quadrajet Carb Talk and Tips / Re: qjet for 250 inline 6
« Last post by Cliff Ruggles on July 19, 2018, 07:54:51 AM »
The Chevy 7028212 is only similar to the Pontiac OHC 6 carb in appearance, completely different set up in every area so pretty much none of the set-up specs would be a good starting point if used with the Chevy carb.......Cliff
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Quadrajet Carb Talk and Tips / Re: qjet for 250 inline 6
« Last post by A.G.V.chevyfreak on July 19, 2018, 05:49:37 AM »
Thanks for reply.   Will probably go with the 7028212.  Just wanted to know the pontiac specs to get a ballpark on where to start. Especially idle side. Wil fit carb and take it from there on tuning to suit.   
Bore is at 4inch now, head ported and comp ratio calculated at 9.45 ,Cam will be in 200 to 210deg duration. Still in discussion with the cam grinder on that. 
Would really like to run a qjet on this motor, best carb ever build.
4 of my motors is fed by qjets.  2  327 chevy motors , the pontiac 455 in my impala and have a newer style 1705  converted for boost ref on piston , on a 471 blower inline 292.   
Thanks for reply.
chevyfreak.
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Quadrajet Carb Talk and Tips / Re: qjet for 250 inline 6
« Last post by Cliff Ruggles on July 19, 2018, 04:33:08 AM »
Both of those would do fine on a 250 six.  For the smaller CID you may have to reduce or eliminate any idle bypass air unless a larger than stock cam is used.

Stock jetting would be the best starting point and most likely no need to modify the idle system as both were pretty generous with idle fuel in stock form.......Cliff
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Diagnose a Quadrajet carburetor problem / Re: Air Valves Not Opening
« Last post by Dogmeister on July 17, 2018, 04:24:23 PM »
The problem was the pulloff was not opening at WOT, and there did not appear to be any issue with the linkage. I'll let you know what happens when we're able to take a look at it.
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Quadrajet Carb Talk and Tips / Re: qjet for 250 inline 6
« Last post by A.G.V.chevyfreak on July 17, 2018, 09:21:22 AM »
Hi cliff.

The 2 carbs i have that i can use there is.
   7028212 that came off my 327. All still stock on this one.
 And then 7044233 that actually came off a caddillac, has small jets and needles.

Thanks.
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