Dual-jet ?? Opinions welcome.

[omaha]

    Would anybody know the CFM rating on a Dual-jet?  (I realize there just the fron half of a Qjet)
    How big of an engine would it support on a daily driver application?
   How many miles per gallon could one get with one if it were installed on a 305 in an old chevelle with an overdrive trans?    I bought a couple of them at the last swap meet, 5 bucks each, I paid more than that for my hamburger and pop at the swap meet. (I'm thinkin fuel milage motor down the road).
What would be the best wat to set up a carbed engine for mileage with one?  (I'd like to try and fit one on a slant six also, would you mount the carb sideways or normal, front to back on a straight six engine?)

[Toronado]

500cfm

"Rochester "Dualjet" (2GV) two-barrel carburetor. Rated at 500 CFM, this larger carburetor was necessary for the larger displacements of the small V8 engines. It too gave ample power, while achieving good gas mileage.
There were actually two versions of the 2GV. The SAE 1-1/4" bore version was used on Camaros 327 and 307 engines. It can be easily identified by the fuel line inlet being located on the side of the carburetor. The larger SAE 1-1/2" bore version was used on 69 Camaros with the L65 350 engine. The fuel line inlet is located on the front of the installed carburetor.

The 2GV models specified for cars with air conditioning had a "hot idle compensator" feature. When high under-hood temperatures occurred during idling, the compensator supplied additional air to offset excessive fuel vaporization."

My opinion is a 4bbl is better, the front being 250 is dang small, just lock
out the secondaries if gas is a concern, then if you need to haul weight just un-lock sec.
bam. There are 2bbls that are only 200cfm by Holly which may get better mileage.

[Paul]

I will second Tornado's opinion.

[omaha]

   I was trying to find out the info on the M2ME, not the 2GV. Sorry for thr mix up.
This carb was used in the late 70's and the eighties on alot of gm V-6 and small V8's. It was acrually just the fron half of a M4ME Quadra-jet.   I was jst wondering about the cfm and if anyone was runing one.

[Toronado]

The M2ME cfm rating is:

 "There were 5 different CFM ratings for the 2GV. 278, 352, 381, 423, & 435"

You can check your & find out its size by measuring it,

"1 1/4" flange, 1 7/16" throttle bore, 1 3/32" venturi - 278 cfm
1 1/2" flange, 1 11/16" throttle bore, 1 3/16" venturi - 352 cfm
1 1/2" flange, 1 11/16" throttle bore, 1 1/4" venturi - 381 cfm
1 1/2" flange, 1 11/16" throttle bore, 1 5/16" venturi - 423 cfm
1 1/2" flange, 1 11/16" throttle bore, 1 3/8" venturi - 435 cfm"

The Dualjet or M2ME, (a Q-jet cut in half),