At first I thought it was a screw-up, but this is 2 S6 Carter BBD carbs I've pulled apart that have different size metering rods. The inside rod (closer to the engine) is leaner (larger dia) than the outside one. What exactly is the purpose of this? It's not like it's a progressive 2bbl like a Weber or Holley on a 2.2.

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Rob M
'80 D100 SWB stepside, S6 4-spd OD

are they rebuilts? possible mix and match reman crap.

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

Step's guess is the same as mine. AFAIK the two metering rods are supposed to be the same on any given BBD.

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

Where did you get these carbs? An old slant six tuning trick for two barrels was to keep the inboard mixture screw 1/4-1/2 turn leaner than the outboard screw. This was to try and even out the mixture to cylinders 3 & 4 which normally get a slightly richer mixture than 1, 2, 5, and 6 due to the inboard barrel of the carb being closer to cylinders 3 & 4. If the carbs used to be owned by a savvy slant sixer, maybe they tried to achieve the same result with the metering rods?

Both carbs are off Dodge trucks, 2 different trucks from different owners. 1st had a reman sticker on it and was very clean, so obviously a fresh reman. The other has no reman marks or stickers but has apparently been rebuilt before, as the boosters were in upside down

Neither carb runs right either, which I think is due to the wrong gasket between the base plate and the body. It's the only thing I can think of, as I've had both apart and completely cleaned and they still act the same. They will run as long as you hold the revs up or pump the gas, but will not idle at all. Different metering rods I don't think would cause this, but the wrong gasket may, and they both have been apart before, so... It's just odd to find the exact same problem and exact same parts in 2 different carbs.

BTW I made both rods the same in one carb, didn't change anything. They are both the BBD that uses the AFB-type jets.

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Rob M
'80 D100 SWB stepside, S6 4-spd OD

Interesting. Take the better of the two carbs and get a gasket kit. Match up the holes and voids and see if that solves your problem. Also, check your choke pulloff diaphragm and the vacuum advance diaphragm on your distributor to see if these are ruptured.

I have worked on many of these over the years. I have seen the rods as you mention, but I have equally as often found a damaged or warped base or contact between the top and the body. I check them with a straight edge and then dress them with a flat file, and have never really had a problem with them after that.

rock
'64d100

Well, I have another gasket that is slightly different, but it looks like it blocks some passages. I think there are 3 different gaskets though, right? There are also differences in the throttle plates, one has some extra ported passages it looks like. I'll see if I can get some pics, this is becoming rather interesting

I think at this stage, a lot of carbs have been reman'd/rebuilt at some point, and who knows who is slapping them together at the reman facilities, and whether or not they really know what they are doing. I figure there are quite a few flunkies tossing these together, just like "Hmm, that looks the same, it'll work" The amount of horror stories I hear of bad reman's kinda reinforces it.

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Rob M
'80 D100 SWB stepside, S6 4-spd OD