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Re: Setting Idle speed on 67 hemi carburators
[Re: rtpete]
#2114519
07/21/16 01:50 AM
07/21/16 01:50 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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there would have to be the idle speed screws on the side of the AFB's
live every 24 hour block of time like it's your last day on earth
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Re: Setting Idle speed on 67 hemi carburators
[Re: 62maxwgn]
#2114842
07/21/16 02:52 PM
07/21/16 02:52 PM
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Joined: Aug 2003
Posts: 43,157
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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No idle steed screws on the mechanical linkage,idle speed is adjusted by the air bypass screws on the front of each carb.Open each mixture screw 1 to 2 turns out on both carbs.Set the idle air bypass screw on the front of each carb one turn open then adjust equal amounts in or out until you get the desired idle speed.Start with the front carb and adjust the mixture screws in one at a time until you start to lose rpm.s then back off 1/4 turn,you may have to go back and adjust both again to get it right.make adjustment with interconnecting linkage disconnected.This is a set of 3447 Max Wedge carbs,same set up.  The big brass idle speed screw in the middle of those type carbs. controls the idle RPM 
Last edited by Cab_Burge; 07/21/16 02:52 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Setting Idle speed on 67 hemi carburators
[Re: rtpete]
#2115157
07/21/16 10:16 PM
07/21/16 10:16 PM
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Joined: Aug 2003
Posts: 43,157
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Remove one of the carbs. and look at the bottom of it and use the base gasket that matches your carb. on every hole or passage  If I'm remembering correctly there should be one slot in front, not two holes, and the front should have smaller primary cut outs than the rear sizes IHTHs 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Setting Idle speed on 67 hemi carburators
[Re: rtpete]
#2115333
07/22/16 06:07 AM
07/22/16 06:07 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I know middle is the idle control air bleed. But I cant get my idle down below 1200.If I have the wrong base gaskets.Do you think that could be causing my problem? The kits come with 4 different gaskets. Does anybody know which one is correct? The big screw in the middle is not an air bleed screw as it controls how much air the eng gets at idle. They do this instead of an idle speed screw on the linkage that moves the throttle blades. They just close the throttle blades so much and then control the air to the eng at idle by that big screw. Make sure your throttle blades are closing all the way at idle as you dont want anything holding the throttle blades open more then should be. I agree with everyone as it sounds like a vacum leak or the throttle blades sticking open some as the eng seems to be getting to much air at idle. Good luck , Ron
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) to see if the linkage is causing ypur problem, if it idles fine or won't idle with them disconnected adjust the big idle speed screws to get the RPM you want