I have a 1977 ford f150 4wd with a true 400 modified (not 351 stroke) and my carb is bad. But today I have come across a autolite 2100 two barrel carburetor from a old mustang. Will this carburetor work with my engine? the markings on the side say g5af on the side. Im not sure if autolite 2100s are made in different sizes or not

 

my old cab is a edelbrock on a adaptor and aint good for the engine, its eatin up the crankcase

 

I think you might want to find a 2150(IIRC that's the number) its from a 360/390/400. What engine did the 2100 come off of? You may just need to re jet.

 

not real sure what it came of of. but that 2100 all i can find. i cant really afford to buy anything. but is there a set of jet for the 2100 i could put on it for a 400?

 

my truck has no emissions control what-so-ever, i live at sea level, i use it for off-road, farm, hunting, and driving. what kind of jets should i get

 

See how it runs with it on there first with new plugs in it aswell. Drive it for a day or two and pull the plugs and check. Then that will tell you if you need to richen it up some or a lot. Chances are it came from a 302 so you might wanna try 4 sizes bigger as a ball park range. You can also do a full throttle test. Get on a straight road and get up to about 50 mph and put it to the floor. As your building speed slowly let off, if you pick up speed faster rejet bigger.

 

The venturi diameter of the carb is 1.14. I have a stock manifold

 

Last year for 2100 series 2V: 1974 / No such thing as G5AF, it's C5AF / With an carb ID tag number prefix of C5AF .. the carb is from a 1965/66 Ford/Merc Passenger Car.

The carb kit is the same for ALL 1962/74 Passenger Car/Truck, 1966/74 Bronco, 1969/74 Econoline Auto-Lite/Motorcraft 2100 2V's = D4AZ-9A586-A replaced C2AZ-9A586-A & B (Motorcraft CT-499-D).

1975/79 F100/350's, Bronco's and Econolines came with 2150 Motorcraft 2V's. There are FIVE! different carb kits, the carb ID tag number is required to get the correct kit.

There is no such thing as a "true 400 modified" aka 400M. FoMoCo never referred to the 400 as such, just plain 'ol 400.

351M (M = Modified) = 1975/79 misc FoMoCo Passenger Cars, 1977/79 F100/350, 1978/82 Bronco, 1980/82 F150/350.

400 = 1971/79 misc FoMoCo Passenger Cars, 1977/79 F100/350, 1978/82 Bronco, 1980/82 F150/350.
All 1973/79 FoMoCo vehicles came with PCV and EGR valves as both were mandated by the US Gov't. Some also came (especially CA vehicles) with the Evaporative Emission System and T/E = Thermactor Emission aka smog pump.

Cat converters introduced in 1977 F100/350's, Bronco's and Econolnes. It all depended on specific state emission laws if 1977/79's came with a cat ot not.

If your truck has no emissions related parts what-so-ever, parts were removed by-a-previous-owner. Thank your lucky stars you don't live in CA!!

 

to make adjustments to the carb i have been told to buy a vac gauge. ive look up how to do it and its simple. i went to www.junkyardgenius.com

 

Well,I have pcv, but no egr or any of that mess,the last guy took it all off. If I used a 2150 it wouldnt work right. I need to know if the diameter of the venturis will fit my stock manifold.

 

As mentioned your jet sizes will be to small in this new carb. But since you have your original you should be able to swap your jets into this new carb and then be correct.

Someone please correct me but I think the jets will swap; at least the mains.

.

 

I don't have the original 2150, i have some old edelbrock performer on a 2bbl to 4bbl adapter which fouls plugs, causes flooding, and causes way to many corrosives in the crankcase.

 

Go to the local parts house and get some jets they are about 2 bucks a set. I'll try to get my stock 2150 apart and see what size jets are in it. Have you measured the manifold yet to see if it will work? If it works then run it and rejet to a factory setting, then tweak from there to get it running right.

 

Ohiocrewcab thank you for all your help

 

but yall, is a 1.14 too small for my 400