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How is it performing?

See thru carb and high speed video.

Just found photos of a recently sold 3854S AFB on Ebay which is pictured with the choke pull-off valve (choke vacuum diaphragm) connected to the port I use for distributor vacuum advance which is on the front of the carb right alongside the passenger side idle mixture screw. My 3854S AFB...

I found what I believe to be a Carter AVS 4966S carb on the hodgepodge 340 I purchased a few years ago (kind of hard to read the model number see photo). Anyway, did a search on the carb number and found fellow forums members believe it to be 625-630 CFM and came on low-performance 1971 440's...

A previous owner replaced the factory gas cap with a push on locking one that is marked "non-vented". Is that the correct application for a '65 Plymouth Signet convertible? Thank you.

Just got my throttle cable wrapped around the drill attachment used to remove rust when I ventured too close. Now I would like to verify that two-barrel and four-barrel cables are identical so I don't purchase the wrong item. Thank you!

Before re-installing the fuel tank that was purchased ten years ago (and painted a RustOleum John Deere green) I performed an inspection and test. The paint held up well. The new tank had an oily film when it was shipped. I was surprised the paint adhered so well, I must have worked had...

I started to gather the gas tank stuff for the '65 Formula S and then clean things up. I grabbed a large diameter filler pipe and tried to stuff the smaller diameter pipe inside (silly me). I was soon to find out they don't belong together. The large pipe must have been in among some of the...

I understand a choke pull off keeps the engine from running too rich at initial cold start-up. So I was wondering how a '65 carb without a choke pull off can do the same thing, or can it? Thank you.

I will someday install a factory 340 intake manifold and 340 Thermoquad on my Mopar two-barrel small block. I find I have purchased (on-line) installation fasteners for the thermoquad, one package has bolts, another has threaded studs. Is there any rule of thumb the factory used when installing...

Are they discontinued or might their be a superceded part number? Thank you.

I thought "dry" meant mounted on dash with no risk of fuel leaking into the cabin, but the article describes "wet" as oil filled and "dry" as without fill: Fuel Pressure Gauges: Liquid Filled vs. Dry

I read where cfm ratings are calculated using different criteria for two-barrel and four-barrel carbs. I wonder is that because it is assumed that the two barrel flows at a higher velocity because of the smaller cross section? Thank you.

Just for us, they should have included a carb/non-computer controlled vehicle as well:

This video may answer the question:

Just curious. I would prefer having a manual choke if I had the choice. The fast idle often does not kick off soon enough for my preference.

Some of the Mopar under hood factory tune-up decals recommend a lower idle speed for the first 300 miles during break-in. I wonder why?

For example, I see on Ebay there is a Thermo-quad listed for manual transmission. My vehicle is automatic. Thank you.

And what is the science/physics behind it? Thank you.

Actually, just swapped the air cleaners on a BBody. The unsilenced '68-'69 340 air cleaner, using my custom aluminum two-barrel carb adapter, now sits about and inch and a half higher than the '72 factory single snorkel 318 air cleaner. The 340 air cleaner is just kissing the hood insulation...

Back when my parents purchased a special order '71 383 equipped Plymouth (road runner), I had our local mechanic install a couple of accessory SW brand gauges, manifold vacuum and oil temperature. However, the vacuum gauge always bothered me because at idle (around 12", if I remember correctly)...

My second hand TQ is missing a electric solenoid that I found pictured on another carb for sale. Don't think I need it, but nonetheless I would like to know what it's purpose was on the factory vehicles? Thank you.

I have a '72 ThermoQuad (6139s) but purchased a NOS '73 charcoal vapor canister that uses a hose from the base of a '73 ThermoQuad (6319s). If I find a used '73 TQ, can I just change the throttle/base plate over to the '72 model so I will have the correct vacuum fitting? Thank you.

I plan to swap intake manifolds one of these days, 1972 factory small block two barrel manifold/Carter BBD with divorced choke to 1973 factory four barrel manifold/ThermoQuad with divorced/electric choke w/timer thingamajig. Will I have problems with the electric choke not opening all the way if...

Looking over a factory Mopar 1972 340 auto ThermQuad 6139S I have to rebuild. When I open the throttle plate fully the primaries go full vertical but the secondaries are almost there, but not quite. Probably just a little more near vertical than in the fotos, but definitely not as vertical as...

While studying the prospect of carb/intake manifold/air cleaner changes and combinations it becomes necessary to consider air cleaner to hood clearance. My findings for a '72 318 Bbody shows I have more than 1" and less than 1 5/8" air cleaner lid to inside hood insulation pad clearance at the...

I plan on using my 318 two-barrel Carter BBD carb on my 340 during break-in, but would like to sport the 340 air cleaner at the same time. Are adapters available to mix the two parts? I have a ThermoQuad for later. Thank you. P.S. No, I am not going to run 2 two-barrels.

Maybe just to be different? I was reading full throttle they are great, idle and low speed throttle response not so great.

This has happened three times in a row now, with three different carburetors, you know, the '60's and '70's Carter two-barrels used on small block Mopars. When I am done cleaning, checking, and installing the carbs, the accelerator pumps just don't want to pump anything more than a micro-drop of...

Thanks for your opinions.