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1961 - 1966 F-100 & Larger F-Series Trucks Discuss the Slick Sixties Ford Truck

Carburetor Advice?

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Old May 24, 2011 | 12:58 AM
  #1  
Tobys351.9's Avatar
Tobys351.9
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Carburetor Advice?

I recently rebuilt the Autolite 2100 on my '66 352 and
can't seem to find out much about jet size.
the tag's info.
C6TF T
E 6DA
Venturi diameter stamped on side 1.14
From what I found out it's a '73 ish automobile carb with man. choke.
It seems to gulp down the gas fine after rebuild and I haven't
had any problems with getting it to run smooth for now.
It's one of them vented bowl carbs and it just seems weird that
they would design something like that.
Again, my only real concern is about the jetting, it has 51's in it and
I am not that savvy with the brand.
Pretty simple, easy carb to work on, I'm wondering if it would do
any good to jet it smaller?
I live about 200 ft. above sea level in the MidWest and have a
right foot that although it may not be made of any one particular
type of metal, it is rather heavy for it's age. + Gas here is real Cheep $3.85
The motor is stock going thru single exhaust.
Any advice will be appreciated.
Thanks T.
 
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Old May 24, 2011 | 08:46 AM
  #2  
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If your tag starts with c6tf then that is saying 1966 model year. Why do you think it is 73 ish carb??? Also, if you are concerned about jetting, you don't want to do anything until you do an exhaust gas test. That will test any unburned fuel to give you an accurate air/fuel mixture reading. Don't go guessing and put jets in that may lean out your mixture and melt your pistons. You don't want to do that. BAD BAD scenario there. I have heard on from some old time Ford mechanics that those carbs are already set on the "lean" side so you don't want to go lean it out anymore. The best thing you can do is get the sniffer test done to test it and then go from there. The other thing to consider is when did you do a full tune up? Plugs, wires, points, condensor. How old the coil? If one of those is older, failing or wearing out, that will also mess with the sniffer test and give a false reading possibly. Good Luck!
 
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Old May 24, 2011 | 11:05 AM
  #3  
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Tobys351.9
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Mistook Venturi clock face ID for date stamp

OH NO, I never ever makes a carbudater run lean, NEVER.
Blew up too many lawnmower engines when I was a kid to do that.
I was looking at the Identification marks on the driver
side of carb, it has a clock face type marking and a 3L above
it. I thought it was the date stamp but since learned that it's
ID for venturi diameter + not a 73. but a 3L.
Guess that may be the original carb.
 
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Old May 24, 2011 | 04:26 PM
  #4  
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If you have 51 jets then you should be ok. Higher is richer and lower is leaner. My 289 Mustang runs 49 jets and the larger 352 will be a little higher than mine. Elevation has no bearing until you pass 5000 feet above sea level.
 
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