68 AVS - remove lead plugs?
#2729379
01/02/20 03:57 PM
01/02/20 03:57 PM
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Joined: May 2007
Posts: 701 Northern California
lilcuda
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I'm rebuilding my '68 AVS with the single air bleed adjuster and the two lead-plugged mixture screws. Should I remove the lead plugs or not? Engine is stock, but I live in California, so the gas is crummy. Thoughts?
'67 is an abbreviation of 1967 67' is an abbreviation of 67 feet They are not interchangeable.
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Re: 68 AVS - remove lead plugs?
[Re: mattsmopars]
#2729384
01/02/20 04:10 PM
01/02/20 04:10 PM
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lilcuda
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these are the two types of adjusting screws I was referring too. Found these quickly on ebay so not a correct to part number of your carb, but hopefully it helps explain my reply. Mine is like the one in the top photo. I know Scott. I was considering having him do the carb for me, but I didn't want a complete restoration on it, so I decided to do it myself.
'67 is an abbreviation of 1967 67' is an abbreviation of 67 feet They are not interchangeable.
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Re: 68 AVS - remove lead plugs?
[Re: lewtot184]
#2729519
01/02/20 11:38 PM
01/02/20 11:38 PM
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Vincenzo
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When you get to the idle mixture screws, if they are frozen be patient. You may have to use heat with a penetrating oil on and off for a couple days. Because the alternative is drilling them out and can be tedious, especially the first couple times. The above post is correct in that the screw in the middle only trims air, and is good for maybe a full point AFR.
Woodruff Carburetor Specialties 330-799-9479
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Re: 68 AVS - remove lead plugs?
[Re: lewtot184]
#2729693
01/03/20 03:47 PM
01/03/20 03:47 PM
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Joined: Jan 2007
Posts: 2,212 Minnesota
peabodyracing
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removing the lead plugs at the bottom of the carb will expose the mixture screws. these are for gas mixture. the top left hand thread screw is for air only. it's kinda like an adjustable air bleed. the bottom mixture screws can noticeably improve idle quality. removing the top of the carb and taking out the two clusters will expose the emulsion tubes and idle jet (the small brass tube). enlarging the idle jet orifice, especially on automatic trans cars, along with working mixture screws can make a big improvement in idle and low speed engine operation. This is timely and helpful for me too, as I've been unhappy with idle performance on one of mine. When you talk about the idle jet, you mean just drilling out the end of the small tube? Recommendation on how much enlargement is needed? Thanks in advance!
Lead, follow or get the hell out of the way
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Re: 68 AVS - remove lead plugs?
[Re: peabodyracing]
#2729728
01/03/20 05:09 PM
01/03/20 05:09 PM
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lewtot184
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removing the lead plugs at the bottom of the carb will expose the mixture screws. these are for gas mixture. the top left hand thread screw is for air only. it's kinda like an adjustable air bleed. the bottom mixture screws can noticeably improve idle quality. removing the top of the carb and taking out the two clusters will expose the emulsion tubes and idle jet (the small brass tube). enlarging the idle jet orifice, especially on automatic trans cars, along with working mixture screws can make a big improvement in idle and low speed engine operation. This is timely and helpful for me too, as I've been unhappy with idle performance on one of mine. When you talk about the idle jet, you mean just drilling out the end of the small tube? Recommendation on how much enlargement is needed? Thanks in advance! yep. drilling the small tube. generally automatic trans carbs have a .031" idle jet and manuals .035". I run .039" with a 4618avs. mine won't idle worth a crap at .031". you can start at .035" and go from there. I leave the idle air bleeds, bypass, and economizer alone. I also use the edelbrock mixture screws. they have a different tip that doesn't require backing out as far as the factory mixture screws. there are some carter afb/avs tuning tips from carter out there on the web.
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Re: 68 AVS - remove lead plugs?
[Re: lewtot184]
#2729766
01/03/20 07:29 PM
01/03/20 07:29 PM
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Joined: Jan 2007
Posts: 2,212 Minnesota
peabodyracing
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Just what I needed. I'm dangerous now! Thanks much!
Lead, follow or get the hell out of the way
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Re: 68 AVS - remove lead plugs?
[Re: lilcuda]
#2729778
01/03/20 08:09 PM
01/03/20 08:09 PM
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lilcuda
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Having a heck of a time getting the last bit of one of the plugs out. The first one came right out with the second left-hand drill bit. It unscrewed the plug perfectly. I was able to easily remove that screw. The other one is being more difficult. The drill got a tiny bit off center and now I am slowly trying to get the last of the lead out. I can move the screw a little bit, but the threads still have remnants of lead in them.
Any ideas?
'67 is an abbreviation of 1967 67' is an abbreviation of 67 feet They are not interchangeable.
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Re: 68 AVS - remove lead plugs?
[Re: dragon slayer]
#2729786
01/03/20 08:31 PM
01/03/20 08:31 PM
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lewtot184
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I would say be careful. One man's engine is different than another's. Once you open it up, you can't go back to smaller. So I would make sure everything else normally check for proper idle and cruise is checked first. you can go back. done it several times testing.
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Re: 68 AVS - remove lead plugs?
[Re: lilcuda]
#2729822
01/03/20 09:20 PM
01/03/20 09:20 PM
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Joined: May 2019
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Sniper
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Having a heck of a time getting the last bit of one of the plugs out. The first one came right out with the second left-hand drill bit. It unscrewed the plug perfectly. I was able to easily remove that screw. The other one is being more difficult. The drill got a tiny bit off center and now I am slowly trying to get the last of the lead out. I can move the screw a little bit, but the threads still have remnants of lead in them.
Any ideas?
A sharp angled pick will help you get the lead out o the threads.
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Re: 68 AVS - remove lead plugs?
[Re: Sniper]
#2729952
01/04/20 12:47 PM
01/04/20 12:47 PM
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Posts: 36,041 Lincoln Nebraska
RapidRobert
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A sharp angled pick will help you get the lead out o the threads. HF has a set of cheapies that have different angles that will likely work for you
live every 24 hour block of time like it's your last day on earth
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Re: 68 AVS - remove lead plugs?
[Re: dragon slayer]
#2730974
01/07/20 11:49 PM
01/07/20 11:49 PM
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Joined: May 2007
Posts: 701 Northern California
lilcuda
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A bottom tap may help clean much of it out. That's what I ended up using. Had to order it from Amazon.
'67 is an abbreviation of 1967 67' is an abbreviation of 67 feet They are not interchangeable.
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