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BBD--Old vs New?
https://www.slantsix.org/forum/viewtopic.php?t=13006		 Page 1 of 1
Author:  Slant Cecil [ Sun May 15, 2005 8:18 pm ]
Post subject:  BBD--Old vs New?
I need a better carb for my Super Sixed '84 D100. I had 2 older BBD cores (with the external rocker linkage and acc pump stem coming thru the top cover) and 2 newer BBD cores (with a rod/lever going thru the side and the internal acc pump stem). The 2 older cores had bad throttle shafts, the 2 newer ones were tight. Well, when I disassembled the newer ones, the left jet on both cores was so seized up, I rounded off the screw slots. :( I even tried driving in the 4 sided handle end of a small round file (redneck easy-out) without luck.
So, I can rebuild the best of the older cores or buy a factory rebuilt. I'm leaning towards rebuilt.
Three questions.
1.Which seems to be the better performing model, old or new?
2.What year did the new debut?
3.Are there any throttle shaft bushing kits for the DIYer?
Author:  SlantSixDan [ Sun May 15, 2005 9:04 pm ]
Post subject: 
I tend to prefer the older BBD design variants, but I have older pre-smog cars. The newer variants are more easily compatible with newer vehicles. Both kinds run well when set up properly. There are feedback variants of the later type that can be made to work on vehicles originally equipped with an O2 sensor and feedback control.

DIY throttle rebushing? No kits I've ever heard of. It requires precision drilling, ball broaching and burnishing. The actual bushings are typically made out of plain ol' bronzewall valve guide material!

I have a new-in-box (not remanufactured, I mean <b>new</b> in Carter box) Super-6 BBD on the parts shelf. Probably could be persuaded to sell it without too much difficulty, though it'll cost more than a reman. PM me if you want to discuss it.
Author:  Slant Cecil [ Mon May 16, 2005 1:31 pm ]
Post subject: 
A NOS (New Old Stock) carb on a NOS (Noisy Old Slant) truck? That would be like putting perfume on a pig! My truck has been de-smoged, so I think I'll go with a remanufactured early model. I may be interested in your carb when I Super Six my '68 V200.
I seem to recall seeing bushing kits before, but that was back in the 70s, my memory from that era is hazy. Seems like they came with the bushings, a ream and new screws.
Well, off to the parts store.
Author:  SlantSixDan [ Mon May 16, 2005 2:01 pm ]
Post subject: 
Quote:
I seem to recall seeing bushing kits before, but that was back in the 70s, my memory from that era is hazy. Seems like they came with the bushings, a ream and new screws.
Some carbs are specifically designed with field-replaceable shaft bushings, but not Carters or our Holleys.
Author:  Slant Cecil [ Thu May 19, 2005 2:31 pm ]
Post subject: 
I tried Pep Boys, $90, AutoZone $100 and Advance $105. The AZ and Adv were reman by Champion. I went with Advance because they could get it in 1 day, the others were 3 to 5 days.
I decided on the early version, so I asked for a carb to fit a '69 Dart, 318, auto.
I got it and put it on the next day, poured a little gas down the throat, took about 2 seconds to light up and 10 seconds to idle smooth on it's own (don't have the chock hooked up). I set the idle speed and adjusted the idle screws by ear, drove it to work today, ran good, well, real good, but think there may be a little tuning needed to get it to run great. So now I need to install an A/F gauge, which will lead to another question and post.
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