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Autolite 4300 CFM?

June 3 2009 at 6:38 PM
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Bill Sanders  (Login Bsanders1955)
from IP address 75.11.35.208

 
I have a 1970 Mach 1 351C 4V engine with a 4300 square bore carb. The carb was acquired second hand as a reman unit with no tag on it. It has the heater hose type choke spring which I believe was replaced with an electric choke in late 1970 or 1971. I understand the early 4300s (1967 or 68) were rated at 415CFM and the latter square bore units were 600 CFM. My engine is slightly beefed up over a stock 4V, i.e. a 600 CFM would probably be OK but 415 would be too small. Does anyone know how to ID this rating in the absence of the factory Ford carb tag? Thanks, BS

 
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AuthorReply
Ed Jenkins
(Login Galaxie)
Forum Owner
75.205.124.172

should be a # on the carb foot.......

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June 4 2009, 8:29 PM 

on the base of the carb by the throttle linkage.

 

 



Ed Jenkins

Ford Galaxie Club of America member #3350
1966 Galaxie 500 Convertible built in Chicago Illinois, will have a stroker 390( 429 cid?). 780 Holley?, built C6, Crites Aluminum radiator, and a rust free frame from the south. Work continues.

Please visit and revisit the Carb Forum athttp://network54.com/forum/88781




 
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WerbyFord
(no login)
24.23.235.202

Measure the throttle bores

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June 17 2009, 10:14 PM 

On the small 4300, about 450cfm, they are
1-7/16 pri
1-9/16 sec
I think the small version was 1967 only or 1967-1969 at the latest.

On the large 4300, 600cfm, they are
1-9/16 pri
1-11/16 sec
The 600cfm 4300 (1.25" primary venturis) came out in 1968 and ran through 1973, maybe 1974. The fastest stock ones I have are 1968-1972, the 1973 versions are as much as 0.2sec slower in the quarter.

I had a bone stock 351c-4v with the 600cfm auto 4300 on top, car was FAST for a $300 car (hey, this was 1977). Big Torino, stopwatch 0-60mph in 7.0 sec with a 3.00 gear. Good carb for street and mpg.

 
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