Thread: 2bbl 300 6 Ford? Multicarb?

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I am getting another 300 for my 4x4 and was wondering if anyone has ever adapted a motorcraft 2bbl to one of these things like it would be a major upgrade over a 195cfm 1bbl! 300 cubes is alot of motor for 195 cfm. No wonder they peter out at 3500rpm. I am thinking tourque would increase through the operating range with a slightly larger carb. Also wondering about this. I have a carter YF with fresh rebuild and the engine I am getting also has one. I will have a extra intake since I am not having to turn in a core. What I am thinking about is having the intake milled flat on top cutting 2 holes in the intake log 1 infront of where the carb sat one behind it and fabing a billet plate to sit on top covering the original carb hole and alowing me to turn the 2 yf's sideways. Somthing like atached pic. Anyway run progresive linkage where the second carb kicks open at WOT. I figured remove the choke from second carb and disable the idle circuit. How good would it work? Seems like a cheap easy way to add a little kick to it without spending a fortune. I can rebuild the other YF for about $7. Any thoughts?

Thanks for the link I've already visited cliffords before neat stuff but the prices OUCH! guess they really have the market on i-6 performance though. Not much competition out there. I managed to find asite where a guy had done what I want to do with 2 1bbls on his 200 in a 66 stang but he said it didn't work all that well and he had better luck with a 2bbl head which were aparently available on the Aussie version of the mustang. I am thinking that a dual 1bbl setup would deffinately not be to much carb for the engine considering the size seems like it would work better than it would on a 200. Plus I am looking for a low dollar upgrade. How would I go about disabling my second carbs idle circuit? or is this not the best way to go about it would it be better to run both carbs at the same time?

I think you would have to run the idle circuit on both cars, Jacob. Otherwise the off-idle performance would be a bit hard to tune. Very interesting idea and definitely worth a try. Let us know how it works out.

I've yet to hear from anyone that has actualy tried one of the 4bbl intakes how good do they work? or would i be pissing money down the toilet buying one?

Jacob, my pal Bart had one, an old Ford 4X4 with a 300 six, Clifford Intake, Edelbrock carb, headers and a good cam. The thing would pull stumps!!!! Ran really strong for a six, and embarrased a few V-8 4X4's playing in the mud. (Yes, before you ask, one of the embarrassed ones was me!)

Jacob I had a 68 Ford truck which I put in a 300 inch engine. It had a single barrle carb and I went to the clifford 4 barrel set up and she ran like a V-8. You won't believe the torque.

I've seen the 390 carbs and expensive for sure! I have a 600 manual choke edelbrock laying around what about de-tuning it abit or just running it like that? seems like it wouldn't bee too much carb for a 300 cube motor.

Originally posted by jacob_royer
I've seen the 390 carbs and expensive for sure! I have a 600 manual choke edelbrock laying around what about de-tuning it abit or just running it like that? seems like it wouldn't bee too much carb for a 300 cube motor.

Seems like it should work great but just run it like it is, don't detune it unless you have to, put it in the truck and then make shure it isn't running rich and then ajust the ajustment screws, only thing you may need to do is lean out the jetting.

Originally posted by techinspector1
Matt, let me help you out a little here on carburetors. A 600 cfm vacuum secondary carburetor like the Edelbrock will flow 600 cubic feet per minute of volume maximum. That means (assuming the same size for the primary bores and the secondary bores) that it will flow 300 cfm maximum through the primaries and 300 cfm maximum through the secondaries. Bolting this carb on a 300 c.i. motor would mean that the secondaries would probably never be more than cracked open slightly and would never be open all the way. In other words, it would work just fine on this motor. There is no such thing as "de-tuning" a carburetor to change the cfm. It is what it is. The idle adjustment screws on the front of the carb adjust the fuel/air mixture for the idle circuit, nothing else. Of course you can change jets and metering rods to alter the fuel/air mixture in the power range of the motor, but it is still going to be a 600 cfm carb and nothing is going to change that short of boring out the throttle bores and installing larger butterflies. But that would be silly when you can just buy another carburetor that flows more cfm. The 600 that Jacob has laying around could more than likely be bolted to this motor with no jet or metering rod change and work just fine for the next 100 years. I hope this helps your understanding of carbs.

I did know that it would always be 600 cfm, what I mean't by detuning was leaning it out with jets to change the mix ( rejetted would have been better terminology ) but you said it shoulden't need any jetting. He may have mean't changing the cfm though. Thank you for giving me a better understanding of carburators.

Re-jetting is the term I meant to use sorry guys don't want to start a fight I don't really see why I'd need to re-jet it anyway I had it on a 302 and later on a 351w and it worked great. Also had the carb on a 460 but ended up sticking a 750 on instead(460 ran much better with 750) So it seems that a 600 is adequate for just about anything.

Originally posted by jacob_royer
Re-jetting is the term I meant to use sorry guys don't want to start a fight I don't really see why I'd need to re-jet it anyway I had it on a 302 and later on a 351w and it worked great. Also had the carb on a 460 but ended up sticking a 750 on instead(460 ran much better with 750) So it seems that a 600 is adequate for just about anything.

You didn't start a fight.