Q-jet idle mixture screws

I have a 67 4 barrel Rochester carb that is not working so good. I get black smoke and with what appears to be water out of the both tail pipes. The idle mixture screws are totally infective. I can take both screws in or out all the way and the idle doesn't change. Any ideas?  

time to rebuild it... the carb that is...    price carb kits around..   prices vary greatly.. sometimes more that 40 bucks..  and you have to have the carb number to get the right kit..

read up one it... and beware... do not use high pressure air to blow it dry.. there are tiny metering plugs in the top cover that will be blown out.. makes for terrible hesitations..    why do i know about them.. i blew them out of my aunts 67 396 caprice classic quadrajet... do you know how hard it is to find something less than 1/8 of an inch in diameter.. and shaped like a freeze plug with a tiny hole in it..   took my hours on my knees... ...   they are called idle air bleeds.. and high speed air bleeds..

read up on the various versions of the quadra jet..

here are a few articles ... each picture usually had text also..


http://www.circletrack.com/techarticles/ctrp_0607_quadrajet_tech/index. html

http://www.hotrod.com/techarticles/engine/edelbrocks_q_jet_carburetor_r eplacment/index.html

this one covers the electronic version.. but mostly the mechanicals...

http://www.carcraft.com/techarticles/ccrp_0908_qjet_carburetor_rebuild/ index.html

anybody who even thinks of owning a q jet.. needs to read and book mark these articals


http://www.superchevy.com/technical/engines_drivetrain/induction_powera dders/sucp_0012_gm_rochester_quadrajet

http://www.chevyhiperformance.com/projectbuild/148_0403_1974_chevy_cama ro_z28_quadrajet

http://www.chevyhiperformance.com/techarticles/49860_rochester_quadraje t_carburetor

http://www.chevyhiperformance.com/techarticles/0606ch_jet_performance_p roducts

http://www.popularhotrodding.com/tech/0802phr_how_carburetors_work

feel free to ask questions..    also... if thats the original carb.. you want to do that one..  don't let some carb shop swap you ...  post the number stamped into the drivers side..    70??????


wow the system puts spaces in the links...    they all do work... i have tried them.. copy all of them them and paste them into an email to your self...   the links should then work... and you will have them all..  

waynep thanks for the reply. The number on the carb is 7037263. Just below that number and to the right their is a second number which is 3063. Thanks for the info.  

that carb is probably the original...   it comes back to a 1967 400, 428" R-4 4MV

these are similar carbs on that year ..   if you have problems.. reply to the post..      you might really plan on spending the extra few bucks and replace the float also..

oh... and when you take the top cover off...   take the plastic float rod retainer off... put a finger on the top of the needle and seat.. while holding the float pin down.. take a look at the float level... i almost always.. do this..  then scribe a line inside the float bowl so i can put the float back to the exact same spot..   or i can put it back there if the float setting the paper calls for is different..    just makes it easier to reset the float..

7027262, 7027263,
7027272, 7027273,
7037262, 7037263,
7037271, 7037272,
7037273, 7037276


wow/. i googled your carb number...

and came up with this article

http://www.highperformancepontiac.com/tech/hppp_0702_rochester_quadrajet_carburetor_tuning/modifications.html


whats really funny ... the carb kit shown.. will not fit that carb... its for a later model qjet..  FYI...


great ... they also mention the air bleeds in the top cover that you can blow out... if you do it wrong..

http://www.highperformancepontiac.com/tech/hppp_0702_rochester_quadrajet_carburetor_tuning/photo_10.html




Year Engine HP Engine code Trans CR Cam Head Code BBL Carb No. Misc

1967 428 360 HP WG M 10.5 067 670 1-4 7027263 Block Casting # 9786135
1967 428 360 HP XD M 10.5 067 670 1-4 7027263 Block Casting # 9786135
1967 428 360 HP Y2 A 10.5 067 670 1-4 7027262 Block Casting # 9786135
1967 428 360 HP YH A 10.5 067 670 1-4 7027262 Block Casting # 9786135

1967 428 360 HP YY M 10.5 067 670 1-4 7037263 A.I.R. Block Casting # 9786135

1967 428 376 HP WJ M 10.75 068 670 1-4 7027263 Block Casting # 9786135

1967 428 376 HP XK M 10.75 068 670 1-4 7037263 A.I.R. Block Casting # 9786135

1967 428 376 HP Y3 A 10.75 068 670 1-4 7027263 Block Casting # 9786135

1967 428 376 HP YK A 10.75 068 670 1-4 7037263 A.I.R. Block Casting # 9786135

1968 428 375 HP WG M 10.5 068 16 1-4 7028267 GP Block Casting # 9792968
1968 428 375 HP YH A 10.5 067 16 1-4 7028268 GP Block Casting # 9792968
1968 428 390 HP WJ M 10.75 068 16 1-4 7028267 HO exh Block Casting # 9792968
1968 428 390 HP YK A 10.75 067 16 1-4 7028268 HO exh Block Casting # 9792968
1969 428 360 HP WG M 10.5 067 62 1-4 7029263 Block Casting # 9792968
1969 428 360 HP XE A 10.5 067 62 1-4 7029263 Block Casting # 9792968
1969 428 360 HP XJ A 10.5 067 46 1-4 7029263 Block Casting # 9792968
1969 428 360 HP XK A 10.5 067 62 1-4 7029263 Block Casting # 9792968
1969 428 360 HP YH A 10.5 066 46 1-4 7029268 45 deg int. Bonneville Block Casting # 9792968
1969 428 360 HP YL A 10.5 066 46 1-4 7029268 30 deg int. Bonneville Block Casting # 9792968
1969 428 370 HP WF M 10.5 067 62 1-4 7029263 GP Block Casting # 9792968
1969 428 370 HP XF A 10.5 066 62 1-4 7029268 GP Block Casting # 9792968
1969 428 390 HP WJ M 10.75 068 48 1-4 7029263 Block Casting # 9792968
1969 428 390 HP WL M 10.75 068 48 1-4 7029263 GP Block Casting # 9792968
1969 428 390 HP XG A 10.75 067 62 1-4 7029268 GP Block Casting # 9792968
1969 428 390 HP YK A 10.75 067 62 1-4 7029268 Block Casting # 9792968  

Thanks for the info waynep7122. I have a 400 WT that this carb is sitting on.
This thing is really running rough, bad surging at any speed. My eyes burn so bad I could give myself a Lasik surgery if I stand behind it long enough.
I pulled the top off and it has a brass float. The gasket doesn't look to hot either. The choke won't come off high idle unless I do it manually, and on and on. Definitely time for a rebuild.
Thanks again