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I.D. a carb with zero markings

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BigBlue94
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I.D. a carb with zero markings

Post #1 by BigBlue94 » Sun Aug 02, 2020 2:04 pm

I was in the junkyard yesterday and found a basically brand new 2bbl carb on what appeared to be a stock 351M in an 80 F150.

Its raw casting is a bit rough, but the inside looks nicer. The casting is raw, but the linkages and such are chromate treated. There are absolutely zero markings on the exterior of the carb. How do I know what ive got here? I assume its a 2150? What size?

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1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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bubba22349
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Re: I.D. a carb with zero markings

Post #2 by bubba22349 » Sun Aug 02, 2020 2:24 pm

:beer: Nice score! To bad it dosent have the Carb ID tag still on it. If you measure the throdle bores or Venturi size you should be able to get the CFM rating for it. :thumbup: :nod: Edited
Even a bad day Drag Racing is still better than a good day at work!

Current project is a 1988 John Deere 420 Garden Tractor I need a few small parts to get it fixed, plus some cosmetic items, maybe a few attachments, if you happen to have or know of JD 420 parts would welcome the help!

My Ex-Inline 6 Fleet 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

BigBlue94
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Re: I.D. a carb with zero markings

Post #3 by BigBlue94 » Sun Aug 02, 2020 2:38 pm

Thanks. It was just 35 bucks. Will do. Is there a chart I can use for cross reference of bore diameter or do i have to dust off my physics skills?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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bubba22349
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Re: I.D. a carb with zero markings

Post #4 by bubba22349 » Sun Aug 02, 2020 4:28 pm

Sure there are problaly severial lists available, below is a link to one that was posted on this site quite awhile back. All you need to be able to use it is to measure or find the Venturi size. Good luck :thumbup: :nod:

Autolite 2100 and Motorcraft 2150 CFM Sizes
viewtopic.php?t=41010#p301316

Some More Info on the 2150 Motorcraft Carb's Used on the Ford 351 M & 400's
http://grantorinosport.org/BubbaF250/carb/carb01.html
Even a bad day Drag Racing is still better than a good day at work!

Current project is a 1988 John Deere 420 Garden Tractor I need a few small parts to get it fixed, plus some cosmetic items, maybe a few attachments, if you happen to have or know of JD 420 parts would welcome the help!

My Ex-Inline 6 Fleet 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

mtbikerTi
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Re: I.D. a carb with zero markings

Post #5 by mtbikerTi » Mon Aug 03, 2020 6:43 pm

Search eBay or Amazon for "2150 carburetor" and you'll find a bunch that look identical to that.
A quality rebuild kit would be a good idea, I've heard that the diaphragms and such can be on the lower end of the quality spectrum.

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wallen7
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Re: I.D. a carb with zero markings

Post #6 by wallen7 » Mon Aug 03, 2020 7:31 pm

In my many years of rebuilding these carbs you need to check the covers for the power valve and accelerator pump for flatness as people tend to over tighten the screws and warp them. You can take them and sand them on a flat piece of sand paper to straighten them. When the power valve cover is warped it won't seal properly and you will think the power valve is blown out.

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old28racer
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Re: I.D. a carb with zero markings

Post #7 by old28racer » Mon Aug 03, 2020 11:04 pm

As per your 3rd picture it shows that the full back side base is "straight", All & only 2150 carbs are like that. I have never seen a 2100 or 2150 that did not have the venturi size cast in the body under the accelerator pump rod on the fuel bowl side, 1.01/1.02/1.08/1.12/ ect. I learn something new each day.
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

BigBlue94
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Re: I.D. a carb with zero markings

Post #8 by BigBlue94 » Tue Aug 04, 2020 6:20 pm

old28racer wrote:As per your 3rd picture it shows that the full back side base is "straight", All & only 2150 carbs are like that. I have never seen a 2100 or 2150 that did not have the venturi size cast in the body under the accelerator pump rod on the fuel bowl side, 1.01/1.02/1.08/1.12/ ect. I learn something new each day.


I dont see a number anywhere on it.

What part do I measure? The bottom of the bores?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

BigBlue94
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Posts: 610
Joined: Wed Mar 07, 2018 6:38 pm
Location: Hoyt, Kansas

Re: I.D. a carb with zero markings

Post #9 by BigBlue94 » Tue Aug 04, 2020 6:46 pm

So I found a pic of where to measure. Which is really tough to do without disassembling the carb. Without the proper set of calipers, I resorted to a non-locking compass to get to the venturi through the top. It measures out to between 1.14 and 1.21 after multiple tries.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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bubba22349
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Re: I.D. a carb with zero markings

Post #10 by bubba22349 » Tue Aug 04, 2020 7:30 pm

So now you have narrowed down to be a 300 to 351 CFM carb. I wonder since the carb dosen't have any numbers stamped into it, it might be one of those new Chinese Copy's. If so there are some that say they are fairly decent made carb's and they close copy's that can use the Ford parts and carb kits. Awhile back a site member here on the big six forum took one apart and also posted a few pictures about his carb. Good luck :thumbup: :nod:
Even a bad day Drag Racing is still better than a good day at work!

Current project is a 1988 John Deere 420 Garden Tractor I need a few small parts to get it fixed, plus some cosmetic items, maybe a few attachments, if you happen to have or know of JD 420 parts would welcome the help!

My Ex-Inline 6 Fleet 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

BigBlue94
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Posts: 610
Joined: Wed Mar 07, 2018 6:38 pm
Location: Hoyt, Kansas

Re: I.D. a carb with zero markings

Post #11 by BigBlue94 » Wed Aug 05, 2020 9:44 am

bubba22349 wrote:So now you have narrowed down to be a 300 to 351 CFM carb. I wonder since the carb dosen't have any numbers stamped into it, it might be one of those new Chinese Copy's. If so there are some that say they are fairly decent made carb's and they close copy's that can use the Ford parts and carb kits. Awhile back a site member here on the big six forum took one apart and also posted a few pictures about his carb. Good luck :thumbup: :nod:


I assume it is a chinese copy type thing. Machined areas look pretty decent. I dont have a direct use for it, but couldn't leave it shining in the engine compartment like a diamond in a goats as...
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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old28racer
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Re: I.D. a carb with zero markings

Post #12 by old28racer » Wed Aug 05, 2020 7:56 pm

Put a kit in it and it would make a nice cruiser carb for that 240 if you build it back to a stock style motor.
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

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