Re: motorcraft 4300 carb info
 

Vic, yes the 4300D came on many 460`s, but it seems that all the 460`s in the SS/GT classes run the 74 version, which had a Carter ThermoQuad available as well as the 4300D.

Re: motorcraft 4300 carb info
 

i use both needle and seat assemblies in the carb. Primary and aux, and run 9 # of fuel pressure. No flooding issues. Also since the float bowl area is so small i run a number 10 line from the regulator to the carb inlet which helps act as a log and hold reserve fuel.

Re: motorcraft 4300 carb info
 

Duane, whose needle and seat do you use? ... I'd love to be able to run both ,but always had problems with the aux flooding. ....I also use the big line to the carb...... BG reg and pump.........Probably i'm being cautious too, since the AMC factory rebuild kits did away with the aux inlet back in the late ' 70's.....Planning to take the car to the Dutch Classic, I'll have to try running the aux, if the air is good it'll need all the fuel it can get.. ..... .Tom

Re: motorcraft 4300 carb info
 

I've always run both the primary and secondary needle and seat assemblies. I do run a return style regulator. Like I said, just under
7#'s has not been an issue.
I did purchase one ofthe Gross-Jet assemblies. They sent the wrong p/n twice and I gave up. Never did get my money back either!

Re: motorcraft 4300 carb info
 

who sell the grose assemblys???? ,like tom mentioned the rebuild kits that you get today dont have the aux needled and seat they come with a plug

Re: motorcraft 4300 carb info
 

gmonde--I sent you a PM--Comp 387

Re: motorcraft 4300 carb info
 

D & G Valve Manufacturing CO Inc
8 Mount Vernon Street
Stoneham, MA 02180
(781) 438-1789

...also, contact Larry Fulton at Hot Rod carbs...

http://www.hotrodcarbs.com/precisionFlow.html

Re: motorcraft 4300 carb info
 

Tom, i made my needle and seat. Use the same needle and drilled the seat bigger i think i got it like .120 or so cant really remember. Havent had any problems with it so ive left it alone. The aux needle and seat assembly was in the carb and ive never changed it.

Re: motorcraft 4300 carb info
 

Same thing here...

Re: motorcraft 4300 carb info
 

Same thing I did on mine, drilled to .120". .......I'll have to see if I can scrounge up an aux needle and seat to try. I typically run 7#, 9# in good air with just the one inlet, but I know when I jet it up in really good air,it tends to nose over at about 1200'.. .....You can see the A/FR go lean at that point,so the aux valve will definately help .....Suprisingly this is the most anyone has been willing to talk about these carbs. .....The few Ford guys who run them are usually very protective of their info. ........Tom