Carb suggestions
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5th Wheeling
Joined: Nov 2012
Posts: 48
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Carb suggestions
Good morning all, looking for suggestions for a good carb for my truck. 78 Ford F100, three speed on the column, I had it rebuilt and installed a Clifford C series intake and put a Edelbrock 500 CFM carb on it but it’s been years ago and set dormant. It never really ran good with this carburetor. Is there a different carburetor that I should be using? This one seems to be a little big.
More Turbo
Joined: Nov 2015
Posts: 706
Likes: 111
The Edelbrock carburetors generally run rich right out of the box and require tuning by using an air fuel meter.
If you want the best fuel mileage out of any carburetor you choose, an air fuel ratio meter is a requirement in order to adjust the carburetor.
The other requirement is getting the timing advance curve for your engine correct.
What camshaft is in the engine?
If you want the best fuel mileage out of any carburetor you choose, an air fuel ratio meter is a requirement in order to adjust the carburetor.
The other requirement is getting the timing advance curve for your engine correct.
What camshaft is in the engine?
FTE Legend
Joined: Nov 2015
Posts: 30,880
Likes: 4,117
From: Angier, NC
Holley makes a 390 CFM that guys run on AMC 258 six's as most others are too large.
Now if you want to run an adapter you can then run a Holley 2300 v2 carb in the 350 CFM, they also have a 2300 in a 500 CFM but that I know that is to large for a AMC 258 so thinking the same for a Ford 300.
IIRC Cliford 6 = 8 offers a Webber v2 I just dont know what the CFM is but dont think it is over 500 CFM.'I never had good luck with Webber's so I ran Holley's
Dave ----
Now if you want to run an adapter you can then run a Holley 2300 v2 carb in the 350 CFM, they also have a 2300 in a 500 CFM but that I know that is to large for a AMC 258 so thinking the same for a Ford 300.
IIRC Cliford 6 = 8 offers a Webber v2 I just dont know what the CFM is but dont think it is over 500 CFM.'I never had good luck with Webber's so I ran Holley's
Dave ----
Laughing Gas
Joined: May 2021
Posts: 1,155
Likes: 358
From: Anderson, California
That edelbrock carb should be tunable for the 300 engine.
I ran Rochester 2-Jet carbs on my early Chevy 283 engines with very good luck.
There may not be a "perfect" carb, but most will offer good performance once dialed-in for the current engine.
I've never used an air / fuel gauge, but they will show your ratio's for further adjustment.
I ran Rochester 2-Jet carbs on my early Chevy 283 engines with very good luck.
There may not be a "perfect" carb, but most will offer good performance once dialed-in for the current engine.
I've never used an air / fuel gauge, but they will show your ratio's for further adjustment.
Lead Driver
Joined: Mar 2008
Posts: 7,182
Likes: 378
From: Near Los Angeles
Buy the tuning kit for that Eddy and spend some time dialing it in. It is a great carb for that engine. You say it never really ran right. What did it do? not do?
Also, in one post you say it has a Clifford intake. In a later post you say it is an Offy intake. Which one does it have? And, do you have coolant heat going through it?
Good luck.
Also, in one post you say it has a Clifford intake. In a later post you say it is an Offy intake. Which one does it have? And, do you have coolant heat going through it?
Good luck.
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5th Wheeling
Joined: Nov 2012
Posts: 48
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It’s the Offenhauser intake. I don’t know where I got Clifford from. I installed the carburetor on the engine at the same time I installed the intake. But I did not know there was a whole lot of trash in the fuel line in fuel tank, so a lot of that made it into the carburetor. So I disassembled the carburetor and bought the rebuild kit. Put it all back together Now it runs just for a little while and then dies and then will not crank up again. It’s confusing to me. I thought maybe it was a coil issue so I replaced that. No change. If I wait about 20 minutes, it will crank up again and then die. And I do have the heater hoses running underneath the intake.
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FTE Legend
Joined: Nov 2015
Posts: 30,880
Likes: 4,117
From: Angier, NC
Well when it dies if you look down the carb, choke open, move the throttle do you see fuel squirt? What if you spray starting fluid in the carb dose it try to do anything?
If you see fuel squirt and spray dose nothing it is not a fuel issue.
When it dies / will not start check for spark from the coil wire to ground what happens?
I bet no spark. This is normal for a DSII system when the ICM box goes bad. It will heat up and the spark fails and the motor stops running.
After the box cools off the spark comes back and motor runs till the box heats up again.
Some places can test them but because it fails when heated they always test good but fail in the car / truck.
When you replace it do not go for the cheapest one you get what you pay for, as they do not last.
I am running a NAPA top of the line ICM for the last 3 years with out issues.
If you find the new ICM did not fix it you now have a spare for when it does fail.
Dave -----
If you see fuel squirt and spray dose nothing it is not a fuel issue.
When it dies / will not start check for spark from the coil wire to ground what happens?
I bet no spark. This is normal for a DSII system when the ICM box goes bad. It will heat up and the spark fails and the motor stops running.
After the box cools off the spark comes back and motor runs till the box heats up again.
Some places can test them but because it fails when heated they always test good but fail in the car / truck.
When you replace it do not go for the cheapest one you get what you pay for, as they do not last.
I am running a NAPA top of the line ICM for the last 3 years with out issues.
If you find the new ICM did not fix it you now have a spare for when it does fail.
Dave -----
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5th Wheeling
Joined: Nov 2012
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Well, when you’re extremely impatient and don’t know what to do next, you make bad decisions. I bought a new one. I do have a question, though, when meeting this up with an offfenhauser dual port intake, do you use the square flange gasket or the one with four ports?
Lead Driver
Joined: Jun 2006
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From: Near Yosemite CA
FTE Legend
Joined: Nov 2015
Posts: 30,880
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From: Angier, NC
The real question is what side dose the primary go to the outside or the inside being you have a dual port manifold 
Me I would go to the outside.
Dave ----
Me I would go to the outside.
Dave ----
Lead Driver
Joined: Jun 2006
Posts: 5,643
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From: Near Yosemite CA
IIRC the primaries go inside due to throttle cable and linkage...