motorcraft 4300 carb info

gmonde · 09-27-2008, 11:19 PM

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

Duane Eiskant II · 09-29-2008, 04:57 PM

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

Chris1529 · 09-29-2008, 07:39 PM

what CFM is the motorcraft Duane?

Duane Eiskant II · 09-30-2008, 12:24 PM

on the wet flow bench at work its a hole 580

Jeff Lee · 09-30-2008, 06:31 PM

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.

FED 387 · 09-30-2008, 07:12 PM

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

09-27-2008, 11:19 PM	#1
gmonde Senior Member Join Date: Nov 2007 Posts: 615 Likes: 56 Liked 165 Times in 59 Posts	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

09-29-2008, 04:57 PM	#2
Duane Eiskant II Senior Member Join Date: Dec 2001 Location: Alexandria, Va Posts: 501 Likes: 261 Liked 57 Times in 33 Posts	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.. __________________ Duane Eiskant 1354 Stock/Super Stock

09-29-2008, 07:39 PM	#3
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	Re: motorcraft 4300 carb info what CFM is the motorcraft Duane? __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

09-30-2008, 12:24 PM	#4
Duane Eiskant II Senior Member Join Date: Dec 2001 Location: Alexandria, Va Posts: 501 Likes: 261 Liked 57 Times in 33 Posts	Re: motorcraft 4300 carb info on the wet flow bench at work its a hole 580 __________________ Duane Eiskant 1354 Stock/Super Stock

09-30-2008, 06:31 PM	#5
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	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. __________________ Jeff Lee 7494 D/S '70 AMX

09-30-2008, 07:12 PM	#6
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,421 Likes: 529 Liked 333 Times in 180 Posts	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