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#1
03-08-2023, 03:37 PM
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Carburetors
Anyone running a non Pontiac quadrajet on their sprint? I have a 67 Buick with divorced choke, should I replace jets and rods with the same size ones as the OHC quadrajet had originally?
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#2
03-08-2023, 04:28 PM
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I used to run early 80's Buick 252 V6 Carbs on OHC-6's, they worked just fine, just had to richen them up a bit.
It should work fine.
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
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#3
03-08-2023, 04:51 PM
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Thanks
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#4
03-08-2023, 06:28 PM
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Running a Cadillac carb on my Wagon. Someone switched out everything to this one. Runs great.
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#5
03-10-2023, 09:48 AM
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John,
I would compare the primary jets & metering rods between the 67 Buick Q-jet the Stock OHC-6 Q-jet. If they are only a step or 2 richer I would try the Buick as is. If it runs to rich would the lean it out a step at a time. I would not even mess with the secondaries.
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
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#6
03-10-2023, 09:50 AM
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Will do thanks. I've to rebuild the Buick carb so I'll check them.
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#7
03-15-2023, 09:54 AM
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When swapping Qjets from larger cubic inch engines to much smaller engines (And vice-versa) say a 400 to a 250. You are likely to run into difficulties getting the idle circuit to operate properly. Most will run out of adjustment range with the idle mixture screws.
Part of the factory calibrations is the size of some of the holes drilled in the idle circuit. In addition there are some differences in how the venturi's are assembled. The closer you can stay to the carburetor's designed cubic inch application the easier it will be to get nice idle characteristics.
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If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#8
03-15-2023, 10:41 AM
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That is one of the reasons I liked to use the Q-jet from the big Buick 252 V6's. They were the some of the last non electronic Q-jets made, and they were used on the same displacement engines.
But I don't think they would be any easier to find a good core or these days. I always thought a non turbo 301 carb from 78-80 would be a good option also. But I never found one to try out.
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
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