Hello:

In my quest to find a nice working BBD…

Came across a Carter BBD that is listed as the application for a 1977 2 bbl slant six D200 HD pickup—figured I’d give it a try. I do not know the original carb number as the tag is missing.

Noticed some differences right away…not sure what is to be mounted on the back of the carb…some sort of solenoid? Would then this control the massive amount of vacuum coming from the port inside the horn of the carb ?

Installed and car runs nice—but idles way too high—huge vacuum leak from that small circled port. If you place your finger over that port the idle drops 500 rpm. Idle not controllable—idles around 1100. Drives surprising well with really good power.

What belongs on the back of the carb…?

Likely not using this carb…going back to the NOS one I posted about. Just curious what’s going on here

Thanks.

Search this page for idle enrichment and read about the missing diaphragm, cover, vacuum hose, and timer/control mechanism.

What year and model of vehicle are you trying to make this carb work on?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Good read. Now I understand what’s going on.

It’s going on a 73 Duster with 2bbl conversion…so it doesn’t have any of the other parts to make that system work. Additionally, I have the EGR blocked off. Back to the other carb..


As always—thanks Dan!

If that carb otherwise works well, you could drive ball plugs into the no-longer-used passage(s), and just dial in the choke to handle the whole cold-engine enrichment job. Use a № 1232 Electric choke kit, which works better than the OE Super Six choke and is adjustable.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I've had a few BBDs that had that, just left the diaphragm and cover with the vacuum hose nipple in place with nothing hooked to it, never seemed to be an issue when used that way

I would try that but I have none of the OE parts that would have been included in that setup.

Dan-I think I’m going to order that choke for this setup regardless of what carb I end up using. I’ve been okay with the old style on the 1bbl 1920—however I’ve found the BBD to be much more finicky with the factory choke setup.

Thanks for all the good info.

The BBD takes a different bellcrank on the end of the choke shaft for a /6 than for a V8. Easy to change, found mine in feebay, factory Carter part, I needed 2, I got a 3rd for my spare carb. I think they were like $10. That diaphragm for the idle enrichment has come with every BBD overhaul kit I have bought. Which has been many over the years. Just need the nipple with the 3 hole flange to screw on behind that diaphragm.