390 2bbl
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Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
390 2bbl
right now i am running a stock d5te 2bbl manifold on a 390 in a 75 ford truck the carb is a 2150 with 351 cfm is there a problem with running the setup like this and why did ford put 2bbl manifolds on the trucks
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We had a 390 2v in a '66 wagon and a '73 F100--both worked fine.
That CFM will work fine for most driving and I never had any trouble running that wagon up to 100mph, despite the total disconnect between the road and the wheel due to the steering. The F100 ran fine as well. Both were hampered more by restrictive exhaust than by intake limitations.
If your '75 has run stock that way for 29 years, I wouldn't think there is a problem.
If you want problems, put a rich running 4bbl with light secondary springs in it on there and watch your money, oil and rings go out the tailpipe.
And watch for the "You'll actually get better mileage with a 4 bbl because the primaries are smaller than the 2bbl".
Yea, that's true, but keeping your foot out of a 4bbl is like leaving those fresh cookies alone. It's a unnatural act to not step into a 4bbl.
Put a big open air cleaner on it, some headers and twice pipes with a crossover tube and roll on.
That CFM will work fine for most driving and I never had any trouble running that wagon up to 100mph, despite the total disconnect between the road and the wheel due to the steering. The F100 ran fine as well. Both were hampered more by restrictive exhaust than by intake limitations.
If your '75 has run stock that way for 29 years, I wouldn't think there is a problem.
If you want problems, put a rich running 4bbl with light secondary springs in it on there and watch your money, oil and rings go out the tailpipe.
And watch for the "You'll actually get better mileage with a 4 bbl because the primaries are smaller than the 2bbl".
Yea, that's true, but keeping your foot out of a 4bbl is like leaving those fresh cookies alone. It's a unnatural act to not step into a 4bbl.
Put a big open air cleaner on it, some headers and twice pipes with a crossover tube and roll on.
Elder User
Joined: Mar 2003
Posts: 541
Likes: 1
From: Phoenix Az, by way of Fre
I rebuilt my 390 and kept the stock 2bbl carb(rebuilt).
It ran.
Had hot start issues, run on issues, cold idle issues, stumbeling issues, detonation issues... just regular drivability stuff. As long as the truck was moving, and had a light throttle things were fine.
I rebuilt the carb again, hopeing to fix driveability, and again, rejet'd, phenolic spacer... tried it all. (timing, plugs, points, large cap conversion then electronic ignition etc...)
Finally broke down and picked up 500cfm Holley.
Driveability issues went bye bye, throttle response improved, and power is noticably greater...
Was $220 well spent.
If it's a 30 some year old carb, I'd consider tossing it and going with a new one. Whether you choose a stock replacemant or whatever, I went 500cfm because it was $220 rather than $300+ for the 350cfm one.
Good luck.
It ran.
Had hot start issues, run on issues, cold idle issues, stumbeling issues, detonation issues... just regular drivability stuff. As long as the truck was moving, and had a light throttle things were fine.
I rebuilt the carb again, hopeing to fix driveability, and again, rejet'd, phenolic spacer... tried it all. (timing, plugs, points, large cap conversion then electronic ignition etc...)
Finally broke down and picked up 500cfm Holley.
Driveability issues went bye bye, throttle response improved, and power is noticably greater...
Was $220 well spent.
If it's a 30 some year old carb, I'd consider tossing it and going with a new one. Whether you choose a stock replacemant or whatever, I went 500cfm because it was $220 rather than $300+ for the 350cfm one.
Good luck.
Senior User
Joined: Nov 2003
Posts: 215
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From: Planet Earth
Originally Posted by 85e150six4mtod
And watch for the "You'll actually get better mileage with a 4 bbl because the primaries are smaller than the 2bbl".
Yea, that's true, but keeping your foot out of a 4bbl is like leaving those fresh cookies alone. It's a unnatural act to not step into a 4bbl.
Yea, that's true, but keeping your foot out of a 4bbl is like leaving those fresh cookies alone. It's a unnatural act to not step into a 4bbl.
samckernan
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