Best Carb for SB Ford

[okiedragster]

i have a 4300 motorcraft carb on my cleveland now and it does a excellent job..i had to do some tuning on it at first, i had to drill the jets a lil bigger size but i kinda figured that goin in, but once i got that done its been runnin like a champ...oh and it howls just like and ole quad...there is also a 4350 spreadbore...heres a link to show what the 4300 looks like...good luck...
http://www.carburetor.ca/carbs/HTML/...spreadbore.jpg

heres the spreadbore 4350
http://www.drbob.tqhosting.com/tech/..._compared.html

[Rev]

I use a Road Demon 625 CFM, but I used to use a Holley 600 CFM and it worked well.I would probably buy another Holley.

Suprisingly, the worst problem I had with the Road Demon was with the electric choke. It was Taiwanese junk and stuck the carb 3/4 open on the first run right out of the box. I had checked it carefully on installation for free function, and everything worked as it should.

Having that carb stick almost wide open was a harrowing experience. I did modify the linkage to work reliably and have not had problems since then. When I notified Demon about the problem they said only that they would pass that on to their engineering staff (big deal?).

My opinion is that it's still tough to beat a Holley.

Rev

[Blue68Coupe]

Well I bolted on a new 525 Road Demon and I still have the same problem. I don't get it. Since my rebuild I get smoke out the exhaust. All cylinders report 150 lbs of pressure. The builder said he had no smoke after the rebuild but used his own carb. It looks and smells like oil but I also have no loss in oil. I just don't get it. I am at a loss.

[Rev]

If you are running an auto tranny, you could have a bad diaphram in the vacuum modulator. That will allow AT fluid to be sucked into the intake and put out blue smoke with no loss of engine oil. There would be a loss of trans. fluid though. Just a possibility.

Rev