General Category > Quadrajet Carb Talk and Tips
Dance steps, need some help!
77cruiser:
I think I used 1/8 inch long set screws, I don't think they are blocking the channel. Something I might have to check someday.
Cadman-iac:
--- Quote from: 77cruiser on October 20, 2025, 10:34:06 AM ---A smaller IABP would help. Making the LIAB smaller would help too as Novadude mentioned. Some are successful at peening the holes then drill to size. I just drilled & tapped for 6-32 brass set screws.
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I found a post you made with a link for McMasters, but it didn't go specifically to those setscews, and trying to find them on a phone is a bit difficult.
You wouldn't happen to have their part number or item number handy would you? I'd like to order some for this.
Thanks,
Rick
Cadman-iac:
--- Quote from: novadude on October 20, 2025, 01:42:39 PM ---I've peened the lower idle air bleeds from ~.078 down to ~.06x before using an old accelerator pump check ball and a punch (and then qualified both with a drill to the same size). It's not the easiest thing to do, and the casting ended up looking ugly, but it's one way to address this. I don't have any before and after comparisons, as it was a new build and I was changing multiple things at once on this particular carb.
Setscrews as 77cruiser suggested would probably be a better idea. I wasn't sure if I could get a setscrew in there that was short enough so that it wasn't blocking the part of the down channel leading to transfer slots and idle discharge.
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A few years ago I had an old E-Jet that I used to practice on with some of Cliff's technics, and I tried making the lower bleeds smaller using the checkball and punch method, i wasn't happy with the results. So I've been hesitant to try again.
I did successfully plug and re-driill the bypass air passages on a base plate using some 1/8" aluminum welding rod.
I was thinking that if you could drill the lower bleed hole larger but not go deep enough to go through to the passage behind it, so that there's a shoulder to stop your plug from going too deep and blocking the downward channel, then you can use a piece of aluminum rod and re-drill it to the size you want.
The problem with this is that there's not enough thickness around the bleed holes.
I like the set screw idea. It wouldn't matter if you got into the downward channel a bit with the drill or the tap so long as the screw doesn't go in too far. A bit of Locktite would keep it in place.
My other problem is I don't have a good selection of small drill bits. Where do you guys get yours from?
77cruiser:
I get drills from McMaster Carr too. Set screws only come in packs of 50 the small ones anyway.
https://www.mcmaster.com/products/set-screws/set-screws-2~/thread-size~6-32/length~1-8-1/material~brass-1/tip-type~cup/
Cadman-iac:
--- Quote from: 77cruiser on October 20, 2025, 04:56:46 PM ---I get drills from McMaster Carr too. Set screws only come in packs of 50 the small ones anyway.
https://www.mcmaster.com/products/set-screws/set-screws-2~/thread-size~6-32/length~1-8-1/material~brass-1/tip-type~cup/
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Thank you for that, I'll get some ordered ASAP.
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