Quadrajet Build Thread

Oct 14, 2008
7,471
113
Melville,Saskatchewan
I plan on building this 800 cfm model that came off a 85 Buick station wagon with a blown up 307 swirl port motor, had it for 23 years to replace the current super lean current 83 carb on the 70S. I plan on totally recalibrating it for a 220ish duration cam. I need to figure out the air bleeds for this carb for primary metering rods, going to get them from Cliff's High Performance. His big kit will have fasteners, the Metric mixture screws that adjust with a standard screwdriver, the removable plug for the APT, I am notching mine like my 78 carb which allows a part throttle mixture change in seconds. I also plan to buy two fast choke pull offs, one for my 78 carb, try and eliminate the bog, thinking that a faster pull off will help. Also extra Metric mixture screws for the 83 carb. Along with a new copy of the book, about $250 US. I had moved the container outside my shop and the main body was full of water for a month but should be OK, I think. I am also planning on rebushing the primary throttle shaft with Cliff's kit, has a self guiding bit, bushing installer and instructions. I am not sure about the suggested sheet of teflon. There will always be the joining gap, so that makes it less appealing. Amazon does have 1/8" thick sheets, just not sure if I should try it. I will contact Cliff and see if he has an extra power piston metering rod hanger to go with parts I am buying.
 

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olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,471
113
Melville,Saskatchewan
This carb is like my 83 carb, a weird Canadian market decode. It shows it should be a 1980 federal emissions Pontiac carb but starts with a 1708 number which should be a 82 and up model.
 
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64nailhead

Goat Herder
Supporting Member
Dec 1, 2014
3,346
113
Upstate NY
More power to you. Those things are smoke and mirrors to me. One too many circuits beyond 2 lol.

I'm following though - these are, by all means, the most complicated part on the car back in the day - only the best techs were turned into Q-jet guys at the dealerships. I have to add that my Q-jet guy recently passed - it was sad of course because he was truly a great guy. Then my Q-jet panic took over.
 
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olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,471
113
Melville,Saskatchewan
I just remembered, I will have a Power Piston in my 260 Dualjet carb. It fixed my 78's choke linkage problem, now it will provide a Power Piston for this carb. See a Dualjet is good for something, Qjet parts😁.
 
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olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,471
113
Melville,Saskatchewan
So I got all the little pieces from the Dualjet including 51B rods and 72 primary jets. Of course this Dualjet had an oddball long rod on the end of power piston that contacts a treadle valve in the base plate. I think it will be cut off wheel time, other a normal power piston. I sprayed the passages with Motomaster carb cleaner and Kleenflo Combustion Chamber cleaner which really dissolves carbon. I soaked NGK XR5 spark plugs that were gunked up with that combo. A quick blast with crushed glass made them look new. I knocked out the aluminum in the air horn and there some play in the primary shafts.
 

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Bonnewagon

Geezer
Sep 18, 2009
8,025
113
Queens, NY
I have that exact same carb 17080260. It came on a 1980 Firebird 301.
 
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olds307 and 403

Geezer
Thread starter
Oct 14, 2008
7,471
113
Melville,Saskatchewan
I have that exact same carb 17080260. It came on a 1980 Firebird 301.
I wonder how it ended up on a 85 Buick with a 307 swirl port motor. I believe this carb had 44K primary rods with 75 primary jets. It probably had a mid way hanger and on almost every carb I have touched, CV secondary rods.
 

Bonnewagon

Geezer
Sep 18, 2009
8,025
113
Queens, NY
"I wonder how it ended up on a 85 Buick with a 307 swirl port motor." Someone needed a non-CCC carb and it was available. Electric choke too. I can say that it sucked on the 301. I wasted countless hours trying to get it to perform. It worked great as long as you stayed on the primaries. Hitting the secondaries was like a lead balloon. Then the light bulb went off in my idiot head. It was because the rear end gears were like 2.41's and the poor thing could not breath. I backfitted a Dual-jet and- voila- it woke right up. So- dead gears and two barrels worked better. I later modified that Q-jet carb for use on a Trans Am with 3:23 gears and it worked great.
 
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