600 cfm too much?
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Laughing Gas
Joined: Aug 2011
Posts: 1,116
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Aahhh ok..some history would be in order 
well..it is stock. Rebuild 48000 miles ago. My 360 Fe blew up so my friend offered his old 300 in his shop. Only been sitting a year or so. I ordered an offy c intake and dual efi manifolds. Other than that a t18 will be backing it up and..there ya go
well..it is stock. Rebuild 48000 miles ago. My 360 Fe blew up so my friend offered his old 300 in his shop. Only been sitting a year or so. I ordered an offy c intake and dual efi manifolds. Other than that a t18 will be backing it up and..there ya go
Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
Sure you can do it, it will run, you can drive it but other options will work better. You'll just have to be careful on the throttle and tune it really well.
I don't know your manifolds well but assuming a 4bbl intake then that should work fine.
Edelbrocks are easy to tune the basics but not all that tunable, get some springs and metering rods and you should be ok, but they have poor idle circuts and accellerator pumps that are allways going to limit your throttle response with a carb that big of that make on that engine.
Run it if it's what ya got, but if your manifold is set up 4bbl, I would keep an eye out for a 390cfm holly 4bbl, dual pump, manual, with 4 corner idling. They are popular in circle track circuits but usually don't have chokes, you'll need a choke.
If you can run a 2bbl on that manifold then keep an eye out for a holly 2300 390 cfm, great little carb for a motor like that.
If you have a bunch of old ford parts laying around, and can run a 2bbl, a motorcraft 2100 is also an ok carb, they have their issues, but might be free and will likely run better then that edelbrock. I'm pretty sure they will take many holly parts, jets, power valves, etc to tune them.
I don't know your manifolds well but assuming a 4bbl intake then that should work fine.
Edelbrocks are easy to tune the basics but not all that tunable, get some springs and metering rods and you should be ok, but they have poor idle circuts and accellerator pumps that are allways going to limit your throttle response with a carb that big of that make on that engine.
Run it if it's what ya got, but if your manifold is set up 4bbl, I would keep an eye out for a 390cfm holly 4bbl, dual pump, manual, with 4 corner idling. They are popular in circle track circuits but usually don't have chokes, you'll need a choke.
If you can run a 2bbl on that manifold then keep an eye out for a holly 2300 390 cfm, great little carb for a motor like that.
If you have a bunch of old ford parts laying around, and can run a 2bbl, a motorcraft 2100 is also an ok carb, they have their issues, but might be free and will likely run better then that edelbrock. I'm pretty sure they will take many holly parts, jets, power valves, etc to tune them.
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
A 600 cfm vacuum secondary (or air flap like the Edelbrock) carb is no worry on a 300. Edelbrock supposedly claims internal differences, but the 500 cfm and 600 cfm carbs have identically sized bores/venturis. I wouldn't spend more or go out of my way to find a carb smaller than 600 cfm to avoid "over-carbing".
The secondaries are only going to open as needed, so 90% of driving will just be on the primaries. The secondaries may never open completely.
Before you install the intake fab up a plate to circulate coolant (heat) under carb/plenum area - it makes a huge difference in driveability.
And there's no easier time to change a cam than when the engine's on a stand in the garage...
The secondaries are only going to open as needed, so 90% of driving will just be on the primaries. The secondaries may never open completely.
Before you install the intake fab up a plate to circulate coolant (heat) under carb/plenum area - it makes a huge difference in driveability.
And there's no easier time to change a cam than when the engine's on a stand in the garage...
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
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Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
A 600 cfm vacuum secondary (or air flap like the Edelbrock) carb is no worry on a 300. Edelbrock supposedly claims internal differences, but the 500 cfm and 600 cfm carbs have identically sized bores/venturis. I wouldn't spend more or go out of my way to find a carb smaller than 600 cfm to avoid "over-carbing".
The secondaries are only going to open as needed, so 90% of driving will just be on the primaries. The secondaries may never open completely..
The secondaries are only going to open as needed, so 90% of driving will just be on the primaries. The secondaries may never open completely..
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Thread Starter
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Laughing Gas
Joined: Aug 2011
Posts: 1,116
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And if this motorcraft is a franken carb with a holley bottom and motorcraft top? It's all jerry rigged and there's not a stamping or number to be found on it..I pulled it from the shelf today and inspected it for like 30 minutes checking all the common marking spots and then some. I'm not sure how many cfms it is..it came from my 360 Fe. Plus..the c intake..with adapter..will work with two barrel...but I looked at the flow chart on tips and tricks and the c intake has a little ridge to divide flow from a 4 Bbl...anyone ran a 2 on an offy c intake before?