Seen today at a flea market:







- Eric

 

Clever. Two barrel onto a four barrel manifold without an adapter.

 

Damn pretty NOS DualJet faux QJet!

Nothing wrong with that at all.

How much?

 

Usually, DualJet refers to a Rochester carburetor that is functionally the same as the primary portion of a QuadraJet, but with only the front half of the body, and with a unique smaller bolt pattern and air cleaner opening.

I had not been aware of the existence of this version, which is for a late-'60s [whoops!] Pontiac (which is why I put it in the non-Olds-powered section ).


Sorry, I don't recall - lots and lots of walking and looking at stuff, and I had no interest in it myself, so I didn't file that information away.

- Eric

 

Late 60's Pontiac?

Hmmmmm.....

My memory says early smog era Olds. Like 1976-77 260 engine. Ck the pix of every intake in the other thread, see if the A2 intake takes a QJet bolt pattern like this.

Carb number would the application tell of course.

Worth some coin just for the NOS parts- screws, jets, power piston, primary throttle shaft maybe, choke coil, vacuum break unit...

 

Whoops!

Total typo. Thought I'd hit the adjacent key and written "'70s."

The DualJet, in any configuration, was definitely a late-'70s / early-'80s carb.

My mistake.

- Eric

 

Thought the dual jet was the '64'65 four barrel carb, before quadrajet?

 

No way, José.

The pre-QJ 4bbl of which you speak was the 4GC, also known as the 4-Jet.
It was structurally the big brother of the 2GC, or 2-Jet, commonly used on all 2bbl motors from the late fifties through the early seventies.
It was (briefly) replaced by the DualJet because the DualJet's (ie: the QuadraJet's) metering system allowed for tighter mixture control for emissions.

- Eric

 

Fo sho...took one of those nastys off my 260 and plopped it on a 455. Literally could not rev the stock cammed with headers 455 past 3500RPM. They flow 243CFM or something...

 

WHY wouldn't you want 4 barrels to a carburetor?

It seems my carb operates on two barrels unless you really jam your foot to the floor. Then it's just pure awesome all the way to 80MPH.

 

Hmmmmm... it does get one thinking...

"Sure, Son, you can borrow the 442 for the prom, just let me tune it up for a few minutes first [Heh, heh, heh]"

- Eric

 

Because a 260 simply can't use that much air under any circumstances, short of revving it to 12,000 RPM.

There's no point in GM spending the money on the extra bits of the carb which will never be used.

- Eric

 

Ya, I thought they put these on the 231's as well. I even had trouble running my 260 with headers up to 5500, damed thing quit making power at 4000RPM. Yes, this is an excellent idea for those of you with children...

 

also used on poncho 301's from '77-'79 or so.
saved costs on engineering a new carb.
later, they just cut-off the back half and called it a dual jet 210
they are funny to look at, never had the chance to crack one open for a chuckle.


bill

 

I have one of those lurking in my basement

 

I seen one on a 69 impala with a 396.

 

I had one that I use to put on my 69 442 during the winter months back in the day and it ran good with it on there. The carb came off of a 78-77 Omega with a 260 V-8.

 

Chris, I know my 75 Cutlass Supreme 260 definitely had that carb.