Holley 1940.

Boots_N_Slicks14

Boots_N_Slicks14

New member
Spent lots of time searching posts here on this forum and elsewhere, including Holley's site and still can't find what CFM the Holley 1940 carb was rated at. Anyone here know? In case it makes a difference, the carb is on a '65 200 (not sure if it's original to the engine or not). Thanks in advance.
 
The 1940 was a service replacement carb. for the Autolite 1100. As far as CFM someone else will need to chime in.
 
well the 1940 is available in a large (1.75 ")and small bore for the earlier heads

I believe they are better performance then the autolite from my experience and I have owned half a dozen or so 1940s as they also come spark control valve equip t or come with out that on the later ones after 1967 on or so.

I believe they are about 215cfm from memory that I have read someone about a test on them.
 
Howdy All:

Hey Boots, a small t-bore Holley 1940 for a '65 200 engine is likely rated at 185 cfm. Although I have never seen the cfm printed anywhere that I would consider a reliable source, by measuring the T-bore and inner diameter of the venturi I am fairly sure in estimating the cfm capacity to be as stated. If you come across a more definitive number please share all the details.

Be warned, the 1940 is a generic, one-shape and size fits many. They became a Service Replacement carb for Autolite 1100 and 1101 after Autolite went out of business in 1970. They were branded Autolite in 1970 & 71, and Motorcraft from 1972 on.

Hope that helps.

Adios, David
 
CZLN6 speaks the truth.


Both rjseibenick and Mark P are no longer on this forum.

Based on what they said, the 1945, 1946 are just reworked versions of the Holley 1940 replacements.


Ford got into a lot of trouble with Autolite, and decided to sell off the Autolite design to Holley as a 1940 carb.

H-1940-A.jpg



The Ford Falcon 6 handbook outlines all the Autolite 1-bbl 1100 and 1101 modle cfm ratings, but the 1940 Holley/Autolite/Motorcraft is not the same as those.


The the cfm rates are likely to be similar to those quoted for the Chrysler 1945/ Ford Fairmont/zephyr/Mustang/Capri Fox 1946 and 1949 and 61XX versions in the 2.3 liter Tempo/Topaz/Tracer HSC ohv four 4 cylinder "cut down" Falcon 6.


The much maligned Holley/Autolite/Motorcraft 1940 carb has two venturi sizes in 26 generic listings, with the 144/170/200 carb different to the 240/300 Big Six and the 250 small six and probably the 223 as well. Its still around in box loads of NOS, and some proper hard number work can give you ONE OF THE 15 part numbers which yield that nice big 1.352" venturi, wide base replacement if you quiz and check the sellers listings. Users of it find it does a fine job on 250 cubic inch engines, and should work a treat on the little sixes if they have the right 170 closed chamber high compression head or the big valve flat top logs.

It looks like there are a few different versions of the Holley 1940. Ron ( rjseibenick ) at Ford Six is a Tempo racer, and he's measured his 1940 as being a 1.352" venturi carb, although I'm sure that is not the stock venturi diameter for the #R 4529 144/170/200 replacements

If some versions have a larger venturi than the 1946, and the flow rate is 202 cfm as a 1945, and, according to Ron at Ford Six, a 212 cfm rating as a 1940 with a 1.352" venturi.

See link https://fordsix.com/viewtopic.php?f=11&t=11031
And the Holley carburetors and manifolds book.

ISBN 0-89586-433-9

http://ecx.images-amazon.com/images/I/51zR2yBC85L.Image._.jpg

51zR2yBC85L.Image._.jpg


Be aware that there are 26 historic Part Number listings of the Holley 1940.Some are generic, non Ford Std parts, others are full Autolite/Motorcraft listings with a Ford basic part number (BPN) with a letter suffix, and with that tag, you can find with 100% certainty that are carb is a big or little item.

I'll bet the 212 CFM ratings with the 1.352" venturi on 250, 240, 300 and older I block 223 and 262's won't be the same as the generic 144/170/200 item.

It is a big 223/262/240/250 or 300 carb if its PN coded:
R 4454-AAS
R 4468 AAS
R 4509 AAS
R 4520 AAS, additional BPN plate suffix A
R 4522 AAS, additional BPN plate suffix C
R 4523 AAS, additional BPN plate suffix D
R 4524 AAS, additional BPN plate suffix E
R 4525 AAS, additional BPN plate suffix F
R 4526 AAS, additional BPN plate suffix G
R 4527 AAS, additional BPN plate suffix H
R 4528 AAS, additional BPN plate suffix J
R 4536 AAS, additional BPN plate suffix Y (an early 223 replacement)
R 4537 AAS, additional BPN plate suffix Z (an early 262 replacement)
R 4692 AAA
R 4696 AAA

It's the little 144/170/200 stand in item if its PN coded as one of the following:-

R 4529 AAS, additional BPN plate suffix K
R 4530 AAS, additional BPN plate suffix L
R 4531 AAS, additional BPN plate suffix M
R 4532 AAS, additional BPN plate suffix N
R 4533 AAS, additional BPN plate suffix R
R 4535 AAS, additional BPN plate suffix T
R 4693 AAA
R 4694 AAA
R 4695 AAA
R 4697 AAA
R 4701 AAA


The listings for doubting Tom Co's, um Thomas'

3 listings http://www.tocmp.com/manuals/Carbs/Holley/MasterList/index30.html
16 listings http://www.tocmp.com/manuals/Carbs/Holley/MasterList/index31.html
7 lisings http://www.tocmp.com/manuals/Carbs/Holley/MasterList/index32.html
Click to expand...
 
Thanks for all replies. Yes I definitely have the small bore 1940, (confirmed that with a P/N posted by xctasy) I guess I need to measure the bore & venturi to confirm exact CFM, although the 185 number that CZLN6 posted sounds right. I'd like to get my hands on a big bore 1940 with manual choke that would work with the older style distributors.
 
"...I'd like to get my hands on…"
ck in w/the 300/4.9 guys here, on our forum for that motor,
and at FTE (ford-trucks.com, the hyphen might B in the wrong place).
All as egoless and sharing as the "144-250" guys here!
:p
 
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