I tried doing a search but couldnt find much...I want to replace my carter, i rebuilt it about a year ago and it didnt help much. My question is will I gain anything by putting a 2bbl with the adapter on my stock 300? Or will this just put me back at square one with an empty wallet? Any input or alternate ideas are welcome!

 

It all depends on how you drive it but I don't think you will gain much in mpg. There are lots of threads about guys putting on four bbl, maybe try that route.

 

Not gaining much if anything with a 1v x 2v adapter. If you are set on the 2v check with a machinist about altering the stock log manifold to accept a 2v carb. Probably easier to use an Offy C or Clifford intake and use a 2v x 4v adapter. JMO,there isn't anything a 2v can do that a 4v can't do better including mpg...if you keep your foot out of the "Exxon" side of the carb.

The carb gets blamed 95% of the time when the problem maybe in other areas like the ignition. If you have a DS2 it can still be upgraded with an HEI module, better coil like a TFI or after market like a MSD Blaster2 or ACCEL Super Stock along with Spiral core wires and EFI spark plugs gapped to 50 or 55. Check this out. http://gofastforless.com/ignition/tfi.htm

What year is your vehicle?

 

its an 81. I have the DS2. I know that the O2 sensor hasnt ever been changed could that be it?

 

The factory 1 bbl is very reliable. There's no reason to go to the aftermarket, except if you want to buy more gas.

 

Ive always heard that its best to ditch the carter

 

Also I just thought I should be getting better than 12mpg

 

An '81 with an O2 sensor? I would suggest the Cat may be plugged...new 3-way, high flow Cats are available. Check the EGR valve operation...it could be burned out. And do a thorough check for vacuum leaks...those hard plastic lines deteriorate and need replacing. The Carter carb is not a problem. Other system problems are usually in play and must be corrected before taking on the carb.

 

I disagree about there being no reason to do it, I put on a 4 barrel intake and Edelbrock 500 CFM carburetor on mine and the performance gain was really good. My mileage isn't that great, but with rods and jets I can hope for 15. I get 18 on the highway. Now, whether or not the performance increase was worth the money, is a matter of opinion. For me it was, but that's what I like spending my money on. My point is, there are many reasons you'd want to upgrade the 1 barrel carb even though it's a good carb to begin with.

 

That's fine. We all bring our individual preferences to the forum. For me it's how she starts, how she idles incl on choke mode, smoothness of operation, and high on the list...best fuel economy for a large pickup.

 

12mpg? How is the idle? if it seems rich all the time, your problem may be the diaphram in the float bowl. It serves two purposes on the Carter YF, the top side is the accelerator pump, the bottom has vacuum on it to control the metering rod. If the diaphram leaks, you pull fuel right into the intake. Another issue with these is the throttle body to float bowl screws, they work loose and allow the two parts to seperate. If the top portion of your carburetor seems loose, then these screws are loose. I usually locktite these when I rebuild one. Carburetor kit, some kits are junk, I will not use a Tomco kit as their gaskets are too soft and the needle and seat are junk. Make sure your float isn't bad. You may have a California spec truck if you have an O2 sensor, probably has an MCU system (can't read codes) or maybe an EEC3 (almost as bad) If your engine has an orange printed emission label it is CA emissions. Check your distributor advance, especially the vacuum advance, it will kill fuel economy. I agree with either a small 2bbl or better a small 4bbl on a Clifford intake. I had a boy working for me years ago who put 2 Stromberg 4bbls (OEM on 1953 Buick 322 V8) on a Clifford intake. We mounted them sideways like the Europeans and the Pontiac Sprint engines do. Ran great. These were probably 250-300cfm carbs on a 250ci engine.

 

Could the carb problem that 85lebaront2 stated be my issue if i rebuilt the carb less that 1500 miles ago? I cant remember the kit I used but I researched it and found it to be reliable.

 

Probably wouldn't hurt to at least go over the carb and snug up all the screws and mount bolts. Had to do that on mine from time to time as things seemed to work loose.