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What Carb w/ Stock Manifold?
#1
Hi,well I'm sure some one has asked this question B-for! But I'm sick of tryin to get my 4300D carb to Work,I'm DONE..I have a 73 351cj Q code stock Mustang Vert,and I tried to keep it that way but I'm tired of taking the car to a show and have people say wow nice car an it won't start to get it home!!!!! My question is can I put a holley on the stock manifold? if so which one? an what spacers R needed? and which[/b] manifold should I use? I've been reading so many different storys I got a head full of all kind of numbers!if ya been through this PLEASE tell me how ya fixed it! I just want to be able to go for a ride an get back home with out being embarrassed because it won't start to get home....Thank's (now I know why the PO wanted to sell it)
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#2
How do you know it is the carburetor?

How do you eventually get the car started?

You didn't have Q rebuild the carb for you did you?
════════════════════════════════════════════

Some 4300 facts/figures courtesy of Dan Jones:

Ford replaced the Autolite 4100 with the Motorcraft 4300 and a spreadbore
version, the 4300D. Most 4V Clevelands were fitted with one of the Motorcraft
units. Both the 4300 and 4300D use air valve secondaries with fixed jets and
power valve enrichment. The 4300D has the standard Holley/Autolite bolt
pattern which is unusual for a spreadbore and means they will not directly
mount up to most spreadbore manifolds, other than factory Ford intakes. The
only aftermarket intake manifolds that I'm aware of that will directly mount a
spreadbore 4300D are the Holley Street Dominators and Strip Dominators. Those
intakes have a trapezoidal plenum opening that clears the large secondary
butterflies. However, other intakes can be made to work using an adapter
spacer.

Model CFM Venturi Diameter Bore Diameter
primary secondary primary secondary

4300 441 1 ?? 1 7/16 1 9/16 67-68 302 J-Code
4300 470 1 ?? 1 7/16 1 9/16 69 351W
4300 595 1 1/4 ?? 1 9/16 1 11/16 69 390 S-Code
4300 600 1 1/4 ?? 1 9/16 1 11/16 70 351W, 351C
4300 605 1 1/4 ?? 1 9/16 1 11/16 71 351C
4300D 715 1 1/4 ?? 1 9/16 2 71 Boss 351C, 72-74 351C

4300's have a reputation of developing leaks at the front of the carburetor
between the lid or air horn, and the main body. If you plan on modifying your
engine, remember the selection of power valves is very limited so it will be
difficult to tune properly. Also, there are no books on the market for
modifying or performance tuning the Motorcraft carbs. Your best source of
information is a Ford factory repair manual. Jack DeRyke thinks they are an
instrument of the Devil :-)

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#3
Do you intend to maintain the factory intake? Is the car otherwise stock?

a Holley 4150 750CFM vacuum secondary would be a good choice, but sealing to the stock intake might be a problem. Of course all you need to do is pull your carb and try a few square bore gaskets against the opening before you buy a new carb.

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
  Reply
#4
Wolverine;81112 Wrote:How do you know it is the carburetor?

How do you eventually get the car started?

You didn't have Q rebuild the carb for you did you?
════════════════════════════════════════════

Some 4300 facts/figures courtesy of Dan Jones:

Ford replaced the Autolite 4100 with the Motorcraft 4300 and a spreadbore
version, the 4300D. Most 4V Clevelands were fitted with one of the Motorcraft
units. Both the 4300 and 4300D use air valve secondaries with fixed jets and
power valve enrichment. The 4300D has the standard Holley/Autolite bolt
pattern which is unusual for a spreadbore and means they will not directly
mount up to most spreadbore manifolds, other than factory Ford intakes. The
only aftermarket intake manifolds that I'm aware of that will directly mount a
spreadbore 4300D are the Holley Street Dominators and Strip Dominators. Those
intakes have a trapezoidal plenum opening that clears the large secondary
butterflies. However, other intakes can be made to work using an adapter
spacer.

Model CFM Venturi Diameter Bore Diameter
primary secondary primary secondary

4300 441 1 ?? 1 7/16 1 9/16 67-68 302 J-Code
4300 470 1 ?? 1 7/16 1 9/16 69 351W
4300 595 1 1/4 ?? 1 9/16 1 11/16 69 390 S-Code
4300 600 1 1/4 ?? 1 9/16 1 11/16 70 351W, 351C
4300 605 1 1/4 ?? 1 9/16 1 11/16 71 351C
4300D 715 1 1/4 ?? 1 9/16 2 71 Boss 351C, 72-74 351C

4300's have a reputation of developing leaks at the front of the carburetor
between the lid or air horn, and the main body. If you plan on modifying your
engine, remember the selection of power valves is very limited so it will be
difficult to tune properly. Also, there are no books on the market for
modifying or performance tuning the Motorcraft carbs. Your best source of
information is a Ford factory repair manual. Jack DeRyke thinks they are an
instrument of the Devil :-)

After I get it towed home an put batt charger on it some times it starts right up sometimes if ya hold pedal to floor it tries to start but pisses gas out the butter fly linkage,some times U have 2 wack it with a hammer some times it runs great it just won't start.I had the carb apart so many times I had to retap some of the holes!I just want to be able to drive the car I don't want 2 spend any more money on towing or people saying they can fix it and can't.....
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#5
GET-R-DUNN;81110 Wrote:Hi,well I'm sure some one has asked this question B-for! But I'm sick of tryin to get my 4300D carb to Work,I'm DONE..I have a 73 351cj Q code stock Mustang Vert,and I tried to keep it that way but I'm tired of taking the car to a show and have people say wow nice car an it won't start to get it home!!!!! My question is can I put a holley on the stock manifold? if so which one? an what spacers R needed? and which[/b] manifold should I use? I've been reading so many different storys I got a head full of all kind of numbers!if ya been through this PLEASE tell me how ya fixed it! I just want to be able to go for a ride an get back home with out being embarrassed because it won't start to get home....Thank's (now I know why the PO wanted to sell it)

You can with alot of odd spacers and some puddy to fill in the egr plate....I tried to get a edelbrock carb to mate up with my stock manifold...I ran into a big issues!! the 4300D is much wider than any replacement carb out there....So even the mate plates cover part of the original holes and cutts off part of the big barrels in the back...Too me it looked like it was going to cause some serious turbulence issues getting fuel into my intake...That spread bore intake will not like any carb you mate too it besides the 4300D im afraid...You can get other carbs to work on it im sure...But not to total preformance...And i could see you loosing power in tring to do so.."reason why i didnt" I ended up buying a edelbrock manifold..4v cleveland style that will accept holley and edelbrock cabrs with out messing with the flow of them....If you want to look stock..I would just get the 200 dollar manifold from jegs.. then paint it blue.

btw the 4300d is a great carb...Powerfull when you get on it..and good fuel mileage.
  Reply
#6
Jeff73Mach1;81113 Wrote:Do you intend to maintain the factory intake? Is the car otherwise stock?

a Holley 4150 750CFM vacuum secondary would be a good choice, but sealing to the stock intake might be a problem. Of course all you need to do is pull your carb and try a few square bore gaskets against the opening before you buy a new carb.

The car is stock w/ hurst 4 speed,if I can keep the stock manifold I will but if I can't get a carb to work on it I will replace it! what about the egr spacer do I keep it or lose it? all the money I'v spent so far I could of bought a whole new motor!
  Reply
#7
GET-R-DUNN;81116 Wrote:
Jeff73Mach1;81113 Wrote:Do you intend to maintain the factory intake? Is the car otherwise stock?

a Holley 4150 750CFM vacuum secondary would be a good choice, but sealing to the stock intake might be a problem. Of course all you need to do is pull your carb and try a few square bore gaskets against the opening before you buy a new carb.

The car is stock w/ hurst 4 speed,if I can keep the stock manifold I will but if I can't get a carb to work on it I will replace it! what about the egr spacer do I keep it or lose it? all the money I'v spent so far I could of bought a whole new motor!

I been threw just what you have few years ago..i had a 4300d carb...Trust me on this one...Mating up a replacement carb will be a nightmare and you will notice right away that the adaptor plate will cutt off part of the back barrels on your stock manifold...You would save alot of heart ache and time by just getting edelbrock's 4v cleveland manifold."think i paid 180$ for it"..You won't need any plate...i got rid of my EGR plate...Not needed with new manifold...Mine had all stock top end like yours...I put my carb and manifold in a box...And dont throw it away!! Them 4300d's are worth alot of cash.
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#8
Wolverine;81112 Wrote:You didn't have Q rebuild the carb for you did you?
Not me W...If I did rebuild it.. rest assured it would work FLAWLESSCool

LOVE OF BEAUTY IS TASTE..THE CREATION OF BEAUTY IS ART
  Reply
#9
Also, which stock manifold do you have?

Do you have a picture without the carb?

What is the spacing of the bolt pattern?

Is the manifold iron or aluminum?

Not that I will have an answer, just trying to get some facts to eliminate possibilities. Personally, I see no reason to change out the manifold, especially if you happen to have the 1971 Ford 351 Boss over the counter aluminum intake.

Qcode351mach;81118 Wrote:
Wolverine;81112 Wrote:You didn't have Q rebuild the carb for you did you?
Not me W...If I did rebuild it.. rest assured it would work FLAWLESSCool

Isn't that what I implied???Big Grin

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#10
http://www.jegs.com/i/Edelbrock/350/2665/10002/-1 They moved the price up a bit sence i got it years ago...But that manifold will fit any standerd replacement carb you want to put on top with out much of a hassle at all...I was in the same boat as you...I spent alot of cash tring to make a new carb work on my old manifold....I realised what a waste of money i did in spacers and such to try and make it work...So what im saying is...Either rebuild that 4300D or replace the manifold and get a carb "holley or edel" To go on top...It will drive you mad messing with that old manifold...I about pulled my hair out over it years ago...lol

And i notice they put on it....Performer 351-4V intake manifold is designed for street 351C and BOSS 351 Fords that came stock with 4V carb and heads. Will not fit Boss 302 or accept stock Motorcraft spread-bore carb. .<~~~ So reverse engineer that statment...your speadbore manifold will not work with replacement carbs...Just tring to save you a bit of heart ache and hell Wink
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