need new carb help/info for 351c

[meathead333]

time to get a new carb for a 351c. i dont know what i have right now, but it is a 2bbl.

what are the advantages/disadvantages of going to a 4bbl?

i looked on summit, all they had were remanurfactured holleys, these any good?

i think gas milage is more import to me then speed, my rig is a dailey driver, so any suggestion on a descently priced($150-$250) carb?

thanks

 

[natureboy300]

If your 351c is not limited by the 2bbl that is on there its not much of a benefit to go to a 4bbl, although the smaller 4bbls will probably give you a little better throttle response because of the most likely (since I dont know what carb you have) smaller venturi size on the primarys. If you could give a little more info on why its time for a new carb might be able to better answer your question.

NB

 

[meathead333]

If you could give a little more info on why its time for a new carb might be able to better answer your question.

ive had a few tell me so...also i took it to a mechanic to adjust my choke/carb since i couldnt get it. he said the air mixture adjustment doesnt do anything when you screw it or out. more or less said it just worn. he said a rebuild or new carb should be a priority, as have many guy on here have said too. maybe ill post a pic in the morning and some one can identify it.

 

[natureboy300]

I hear alot of guys sing praises about holleys on the forums, just know that usually it is not a slap and go deal, it will usually need to be tuned/jetted for optimal performance of your engine. If you go with a holley you want a vacuum secondary model, and will want to make some modifications to it if you do alot of offroading (there is a tech article here on the board) to allow it to perform better at angles.

NB

 

[TOFIC]

time to get a new carb for a 351c. i dont know what i have right now, but it is a 2bbl.

what are the advantages/disadvantages of going to a 4bbl?

i looked on summit, all they had were remanurfactured holleys, these any good?

i think gas milage is more import to me then speed, my rig is a dailey driver, so any suggestion on a descently priced($150-$250) carb?

thanks

If your looking for gas mileage and a little more go power keep the 2bbl
Just send it to Pony carbs for a tuneup. Works really good on my 351 with an Autolite 2100. Pony played with it and it works great now
TOFIC

 

[bandit]

I just went to a TruckAvenger,and my '73 is running the best it's ever run.I re-jetted it myself,and set the mixture with a twenty dollar vacuum gauge,as the Holley techs recommended .I'm no mechanic,and the adjustments were very easy.I believe there is a new replacement for the 2100 series if you look harder,at least there was a couple of years ago.I really believe that four barrells can get better mileage,since the primaries are smaller,but of course if you keep kicking in the secondaries,you'll suck up more fuel.
BANDIT

 

[meathead333]

can someone tell me the difference between these carbs, other than the price...

http://store.summitracing.com/default.asp?target=eadvsearch.asp&SearchType=Engine

 

[broncnaz]

Your link doesnt show any carbs
Personally I'd go with a holley probably the rebuilt ones just make sure its a 4160 model with side hung fuel bowls and adjustable floats then its up to you if you want a manual or electric choke and kickdown linkage.
Generally speaking you should get a little better low end driveability with a 4V and once jetted right good mileage as long as you keep your foot out of the secondaries.
You may want to look at Jegs website the road demon carbs are basically holley's but made by barry grant and run about the same price as holley's but come a little better setup.

 

[meathead333]

heres a few pics of my current carb. anyone identify it?

 

[broncnaz]

Thats the standard motorcraft/autolite 2100 you may just want to get a rebuild kit and a couple of cans of carb cleaner they are very easy to rebuild should only take a hour or so. Thats way cheaper than spending $300+ on a new intake and carb.

 

[meathead333]

where do i get a kit? cost? would a rebuild kit help the adjustment screws?

so if i were to go with one of the $150 holleys, id have to get a new intake too?

i need some help understanding this. would any specifc carb help with my MPG?

 

[broncnaz]

Pretty much any auto parts store will have the rebuild kit. They usually want the numbers off the small tag thats on the top of the carb but I dont think you had one just tell them the year and give them a car mustang torino ect. shouldnt matter much anyway because the rebuild kits usually cover all the carb P/N's just make sure you match gaskets and check valves.
Part of your problem with the adjustment screws may be due to dirt in the air passages once you have everything apart and have the idle screws removed spray carb cleaner through all the passages you should see it spray out somewhere's else on the carb then you will no that its clean.
If you want to go with a 4 barrel carb you will have to swap manifolds. You could go with a 2 barrrel holley but the 2 barrel motorcraft is just as good if not better. While the 4 barrel carbs can get a little better mileage any carb will work if its properly jetted for your engine. But the carb itself is only 1 factor in the quest for better gas mileage the biggest factor is usually a camshaft that matches your overall gearing and style of driving. or just overall gearing that matchs the rpm range of your camshaft.

 

[Skuzzlebutt]

If you get a 4v manifold you will also need 4v heads, which is not a good swap if economy is your goal.

 

[meathead333]

ok, thanks what i was looking for. guess ill try the rebuild kit route first maybe.

 

[Amac70]

You can get a 4v manifold that fits the 2v heads. But im with the others i would start with a rebuild kit. The last one i bought cost less then 30 bucks at napa and took about an hour to do.

 

[broncnaz]

Actually the 4V manifold doesnt require that you use 4V heads it used to be a common swap that was supposed to gain 35hp over the 2V manifold but I'm sure that most of the gain would be in the top end. Edlebrock also has a 351C manifold designed for the 2V heads