motorcraft 4300 carb info
 

any one running a motorcraft 4300 carb,looking for some on set up any info would be helpful,tom thanks for you info thanks gmonde

Re: motorcraft 4300 carb info
 

i run the 4300D on my combo love it. back to back with dads 780 holley off his 71 runs the same..

Re: motorcraft 4300 carb info
 

what CFM is the motorcraft Duane?

Re: motorcraft 4300 carb info
 

on the wet flow bench at work its a hole 580

Re: motorcraft 4300 carb info
 

To clarify, the 4300 Autolite is different from the 4300D Autolite in that the D series is a spreadbore with larger throttle blades than the 4300 "non D", correct? I believe the 4300D was rated at about 715CFM. Correct me if you have other info (I run the 4300 non-spreadbore).
And I probably should not reference this as a "spread-bore". Square flange or spread-bore flange may be more accurate.

Re: motorcraft 4300 carb info
 

According to a buddy of mine these are the specs for both carbs

4300 Carb depending on the particular model these measurements can vary from

441-605 CFM
Venturi 1-1 1/4 in primary

Bore 1 7/16 P--- 1 9/16 S
1 9/16 P-- -1 11/16 S


4300D carb

715 CFM
Venturi 1 1/4 P
Bore 1 9/16 P--2 S

This carb (4300D) is ONLY on 71 Boss 351 Cleveland & 72-74 351 Cleveland engines ---4300D carb will only fit a specific manifold -- Not interchangable with a 4300 manifold WITHOUT an adapter!!!

Comp 387

Re: motorcraft 4300 carb info
 

jeff we do run a spread bore (not much of one ) but it is a square flange bolt pattern
1 9/16 P-- -1 11/16 S and a 605 cfm "man talk about a choke " gmonde

Re: motorcraft 4300 carb info
 

605 CFM carb came on the 1971 351 cleveland engines NOT the BOSS engines those were 4300D==Comp387

Re: motorcraft 4300 carb info
 

The motorcraft and autolite carb with the square (not spreadbore ) baseplate is refered to as the 4300A. As far as I know there were basically two sizes of these carbs, a smaller version that came on the 68 302 and 69 351w engines and the bigger version that came on the 70-71 351c and 68-75 429-460's. I also heard that the AMC's had some of these carbs on their engines. I ran one on my 70 mustang in SS and it is very touchy carb to mess with, a real pain.

Re: motorcraft 4300 carb info
 

4300 carbs were rated @
441 cfm--67-68 J code engine
470 cfm -69 351W
595 cfm-69 390 S code engine
600 cfm-70 351 W & 351 C engine
605 cfm-71 351 C engine
715 cfm 71 Boss 351 C & 72-74 351 C engines--THIS IS THE 4300D CARB