I've been wanting to get rid of the junk 1920 Holley Economaster of my '68 Signet. It had a high speed miss that I think must have been caused by a bad power enrichment circuit. It still was better the the Holley rebuilt 1920 that came on the car.
I wanted to upgrade to a Super Six. After trying to rebuild 5 different junkyard BBDs, I found a good one. I could never remove both jets during rebuild of all of the first 5 so now I have 5 parts carbs. My 6th attempt finnally gave satisfactory results. It had a tight throttle shaft and a peak inside showed it to be clean so I forked over $40 out the door for it at the local You-Pull-It. A $12 carb kit, $3 card spray, and double checking the float, metering rod and accelerator pump adjustments and the car runs like it should. Now I need to use the rebuild instructions and gauge to re-adjust all the settings on the parts store rebuilt BBD on my '84 D100 which seems to be a bit off.
The difference was amazing to me. With the 1920, I could only spin the tires by brake torquing it a bit before mashing the throttle all the way. Now, from an idle, it spins the right rear 15'-25'. I'm ready for the race track! As you guys may have noticed, I'm !

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Slant Cecil

Good work, nothing like giving a SL6 a "little more A/F mixture" to get it's performance to come-out.

I am about to go into a 'round' of BBD rebuilding, I hope I have better results then 1 out of 6!
Any rebuilding advice or lessons learned from your recent work?
DD

I don't have much for tips. The BBD seems simple.
Obvious tip is to start with a good core. Before buying a core, check these two things;
If the throttle shaft has any play, keeping searching for something better. Also pop off the top and look inside for fuel bowl corrosion. A few of the first 5 I had showed only slight corrosion but I still had 1 of the jets frozen to the point where the screw slots sheared off when attempting to remove it.
If anything was remotely difficult was getting the step up piston and metering rods past the metering rod lever.

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Slant Cecil

What year BBD did you do? Tin top? I find on jets soak them with WD40 and tighten a bit first! Then loosen!

Also check the tops for flatness I have a table top belt sander I did mine with. 120 grit was the finest I could find at Lowes. It was flat in seconds.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

There was a 30+ page BBD manual that I printed off a link from this site-I don't have it anymore, but it was a bible for the BBD and showed the differences between the one used on the v-8 and those for the /6. Maybe someone knows how to get to it. Mike

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Good gun control is hitting your target repeatedly