which holly is better?

[kenny170]

Which is the better carburetor Holly 1940 are holly 1946 which flows better?

 

[xctasy]

The 1946 flows better, but needs proper distributor advance and vac line hookup and a specific air cleaner.


The Holley 1940 is a stand in replacement carb that does nothing badly, but nothing well. Too small for a 250, too big for a 144. The 1940 will fit anything easily.

 

[kenny170]

Do you know that cfm rating on a 1946 Holly?

 

[xctasy]

The Search Function is my friend
Oh the search function is my friend
The '40 and the '46 , the search function is my friend.

1. http://www.albertpenello.com/mustang/engine.html

2. Wed Jan 07, 2004, https://fordsix.com/forum/viewtopic.php?f=11&t=11031

Listed in the Ford Six as 195 cfm.

At 1.84"Hg or 25 " H20, a 2-bbl DGAS Holley Weber or 5200 Holley Weber flows 227 cfm, way up on the meager 156 cfm the Holley 1946 flows at that pressure drop.

Rated at 3" Hg, the 1946 flows 200 cfm

3. 07-02-2012, 11:16 PM http://vb.foureyedpride.com/showthread.php?t=134603

4. 1945 Chrysler 225 1-bbl carb is similar, was incorrectly quoted as flowing 170 cfm at 3.0" Hg, but the Mopar air horn and intake is better engineered and less restrictive. http://www.rasoenterprises.com/index.ph ... arburetion

5.The HP Holley book printed in 1976 says the Mopar 225 Holley 1945 came in one size with 1-11/16" throttle bores and flowed 203 cfm @ 3" hg. http://www.slantsix.org/forum/viewtopic ... bc05ea73a5

6.http://classicbroncos.com/forums/showth ... p?t=175726


The Ford Motorcraft Part DOPF-K Autolite 1100 replacement was the Holley 1940 List # 4529 for 200 cid engines, and it flows somewhere between the around 170 cfm and 187 cfm since its a one size fits all replacement approved by Ford as an Autolite 1100 stand in.

The 144 ThriftPower Six had a 1.00 Venturi 120 CFM carb

The 170 ThriftPower Six had a 1.100 Venturi 150 CFM carb
The 200, 250 Six, a 1.20 Venturi 185 CFM carb

The 1940 was a one size fits all 200 replacement, probably about 180 cfm

http://www.youtube.com/watch?v=CzHc0BKexlI

 

[kenny170]

Wow that's great thanks. Way more than I was hoping for.

 

[JackFish]

The 1946 also has a port for a vapour line that goes to a charcoal cannister that must be hooked up to vacuum. You would almost have to pull the entire setup off a fox-body to get all the right pieces. Probably not the best choice unless it's already stock.

 

[xctasy]

It looks like there are a few different versions of the Holley 1940. Ron ( rjseibenick ) 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, accroding to Ron, a 212 cfm rating as a 1940 with a 1.352" venturi.

See link viewtopic.php?f=1&t=58612&p=449841#p450090
And Holley carburetors and manifolds. ISBN 0-89586-433-9

http://ecx.images-amazon.com/images/I/5 ... mage._.jpg

Be aware that there are 26 historic listings of the 1940, and I'll bet the CFM ratings for a 250, 240, 300 and 223 won't be the same as the generic 144/170/200 item
3 listings http://www.tocmp.com/manuals/Carbs/Holl ... dex30.html
16 listings http://www.tocmp.com/manuals/Carbs/Holl ... dex31.html
7 lisings http://www.tocmp.com/manuals/Carbs/Holl ... dex32.html