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#860567 - Wed Jun 20 2012 12:42 AM Auto Choke carb
Spotbiltxo Offline
Shop Shark
Registered: Fri Jun 06 2008 11:34 PM
Posts: 842
Loc: San Antonio, Texas, USA
Picked up a Rochester single barrel carb with an auto choke on it at a swap meet. Can I use it on my 216 to replace the original Rochester B? I'm sure there's an adapter to be able to run the choke tube to the manifold, right?

Thanks!
_________________________
Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
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#860569 - Wed Jun 20 2012 01:05 AM Re: Auto Choke carb [Re: Spotbiltxo]
Hotrod Lincoln Online
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 12506
Loc: Dellrose, TN
As long as the stud spacing is right it will bolt on. Whether it's jetted right or not will be a crapshoot. Check out aftermarket "choke stove" listings to pick up manifold heat. The exhaust gas doesn't go to the carb, just air heated by passing over, or sometimes through the exhaust manifold.

I've seen an add-on heat exchanger that clamps onto the manifold with a couple of screw-type hose clamps, and a tube that routes the hot air to the choke housing. Simply wrapping a piece of copper tubing around the manifold a few turns and securing it with a couple of clamps also works.
Jerry
_________________________
"We have met the enemy, and he is us!"- - - -Pogo
I'm a dyslexic agnostic with insomnia- - -I stay up all night wondering if there's a DOG!

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#860765 - Wed Jun 20 2012 06:38 PM Re: Auto Choke carb [Re: Spotbiltxo]
tclederman Offline
Registered: Tue Sep 18 2001 12:00 PM
Posts: 22934
Loc: Castleton-on-Hudson, NY

This universal choke stove kit might work on a Rochester BC carburetor.
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#860798 - Wed Jun 20 2012 09:20 PM Re: Auto Choke carb [Re: tclederman]
Spotbiltxo Offline
Shop Shark
Registered: Fri Jun 06 2008 11:34 PM
Posts: 842
Loc: San Antonio, Texas, USA
Thanks Jerry and Tim. I guess it's a crap shoot if it will work since I still don't know if this specific Rochester carb was ever intended to be used on a 216, but it's worth a try I guess.

Thanks again.
_________________________
Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
Top
#860824 - Wed Jun 20 2012 10:47 PM Re: Auto Choke carb [Re: Spotbiltxo]
Hotrod Lincoln Online
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 12506
Loc: Dellrose, TN
If it's jetted for a 235, it will run lean on a 216. There's not enough venturi velocity to develop sufficient vacuum to pull enough fuel through the main jet. A bigger jet and/or a higher float level will help, but it's a balancing act on the float level between high enough to flow fuel, and a tiny bit higher that causes flooding. There's also a danger of keeping the power valve open all the time due to low manifold vacuum, which will result in lousy fuel mileage!
Jerry

_________________________
"We have met the enemy, and he is us!"- - - -Pogo
I'm a dyslexic agnostic with insomnia- - -I stay up all night wondering if there's a DOG!

Top
#860834 - Wed Jun 20 2012 11:22 PM Re: Auto Choke carb [Re: Hotrod Lincoln]
Spotbiltxo Offline
Shop Shark
Registered: Fri Jun 06 2008 11:34 PM
Posts: 842
Loc: San Antonio, Texas, USA
Okay Jerry........a dumb question. If the stud spacing is right and it bolts on can I assume it is for a 216 and therefore might be correctly jetted? Or were there different stud spacings for the 235's?
_________________________
Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
Top
#860856 - Thu Jun 21 2012 12:28 AM Re: Auto Choke carb [Re: Spotbiltxo]
tclederman Offline
Registered: Tue Sep 18 2001 12:00 PM
Posts: 22934
Loc: Castleton-on-Hudson, NY

Yes, it looks like there were two passenger carbs with automatic choke. One was for 50-52 Powerglide equipped cars, which would have had a 235 and the wider stud spacing. The other (7005060) was for 37-52 cars and would have been for a 216, with the smaller stud spacing. 1954 and later BC carbs would have been for 235 engines, all with the wider stud spacing.

I am not going to guess about 1953 non-Powerglide car engines and carbs' stud spacing.

http://chevy.oldcarmanualproject.com/1929_54chevyparts/03/200.HTM
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#860866 - Thu Jun 21 2012 02:00 AM Re: Auto Choke carb [Re: tclederman]
Spotbiltxo Offline
Shop Shark
Registered: Fri Jun 06 2008 11:34 PM
Posts: 842
Loc: San Antonio, Texas, USA
Tim, So our trucks never came equipped with carbs with automatic chokes? If not then it's safe to say that this carb I have probably won't run right on my 216.

Oh well............

Thanks very much.
_________________________
Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
Top
#860894 - Thu Jun 21 2012 08:25 AM Re: Auto Choke carb [Re: Spotbiltxo]
tclederman Offline
Registered: Tue Sep 18 2001 12:00 PM
Posts: 22934
Loc: Castleton-on-Hudson, NY

If its a 216 carb, it might work OK. Changing a carb in and out is not a difficult or tricky job, give it a try. If you have not rebuilt the carb, your biggest gamble is if it in working condition.

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#861328 - Fri Jun 22 2012 10:00 PM Re: Auto Choke carb [Re: tclederman]
Kurt_51carryall Offline
Shop Shark
Registered: Sat Aug 27 2011 09:29 PM
Posts: 889
Loc: Raleigh,NC
The 1953 non-powerglide car also had a 235 engine with auto choke, but had solid lifters.

Your truck should run fine with the automatic choke carb if it is for a 216. I ran my 235 powerglide engine for quite a few years with the auto choke before I found a good manual choke carb.

It's just so much more fun to work the choke and throttle, which is why I switched.

Kurt
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