Need a little insight please!!
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Junior User
Joined: Apr 2010
Posts: 71
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From: Baltimore, MD
Need a little insight please!!
Alrighty well Im on the fix of working on my ford again and its time to finally swap over to the 4 barrel and efi manifolds. Upon taking the intake and exhaust manifold off I found out the PO had the motor rebuilt already which I guess is a good thing. I pulled the valve cover and it is sure pretty under there and no carbon build up on the exhaust ports either. I had acquired an Offy C intake awhile ago for an 86 F150 we had that we sold before we could use it. I am ordering the efi manifolds, gaskets, and stud kit this week so I can start putting things back together. My last piece of the puzzle is which carb to go with. Right now the truck has 33" tires, 3.55 gears and a NP435 trans. My intial thought was a 500CFM edelbrock, but have been reading that some have been getting away with 600 ones as well, which you can also find these fairly cheap these days over the 500. The other thing is that I may have a line on a Offy DP as well. Eventually I would like to have the head worked and install a cam as well, but that wont be for a couple more years. So i guess all in all would a 600CFM be to big for the big 6 or should i look for a smaller 4 barrell.
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Joined: Mar 2005
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From: Earth
A 600cfm Edelbrock will work fine, no worries. If you check the specs in the Edelbrock carb manual the 500 and 600 are the same other than jets/rods, etc. anyway.
I've never tried a DP but I'm happy with the C on my Bronco. I'd just use what you've got.
I've never tried a DP but I'm happy with the C on my Bronco. I'd just use what you've got.
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Junior User
Joined: Apr 2010
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From: Baltimore, MD
I knew i was in the right place. Hopefully i can get the rest of the block cleaned up this week and painted. If I am lucky maybe have her running again next weekend. Thanks guys for the help. I will be sure to keep yall posted.
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Junior User
Joined: Apr 2010
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From: Baltimore, MD
One last thing so I can make one order with Summit. What seems to be the best trick for the throttle linkage. I see that everyone likes the Lokar one. Or can the factory one be tweaked a little to make work since the carb will be orientated in a normail position on the offy c intake?
Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
[quote=BaronVonAutomatc;10910015]A 600cfm Edelbrock will work fine, no worries. If you check the specs in the Edelbrock carb manual the 500 and 600 are the same other than jets/rods, etc. anyway.
Ahhhh...no. I was told by an Edelbrock tech, at Edelbrock, that only the boosters are diff. sizes between a 5-600.
Ahhhh...no. I was told by an Edelbrock tech, at Edelbrock, that only the boosters are diff. sizes between a 5-600.
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Joined: Dec 2007
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From: Boise, Idaho
On my '84 Bronco, I have a 600cfm Holley, an Offenhauser C, EFI manifolds, 2.5" exhaust, 3.55 gears, and an NP-435 trans. I haven't done any headwork on it. The only difference between your setup and mine is you have 33" tires whereas I have 31".
With the 3.55 gears and no overdrive, you'll be at a bit higher RPMs on the highway, so the upper end breathing of the C series will be of a benefit to you. I really like the setup.
With the C, you can reuse the stock setup with just a little bit of tweaking. Mine is welded to a small piece of metal with a hole drilled through it. The hole is mounted on one of the manifold studs (may not work with bolts, unless you get a bolt that has a stud sticking out of the head). Then, since the linkage is towards the valve cover, the spring for the throttle is just looped around another manifold bolt. It works very well.
With the 3.55 gears and no overdrive, you'll be at a bit higher RPMs on the highway, so the upper end breathing of the C series will be of a benefit to you. I really like the setup.
With the C, you can reuse the stock setup with just a little bit of tweaking. Mine is welded to a small piece of metal with a hole drilled through it. The hole is mounted on one of the manifold studs (may not work with bolts, unless you get a bolt that has a stud sticking out of the head). Then, since the linkage is towards the valve cover, the spring for the throttle is just looped around another manifold bolt. It works very well.
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Junior User
Joined: Apr 2010
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From: Baltimore, MD
AB thanks for the input. I will be using studs. I couldnt imagine trying to line all that stuff up while holding the gasket at the same time. I will also be getting the Mr. Gasket intake/exhaust gasket as well along with a rebuilt 600 edey from summit.
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Postmaster
Joined: Mar 2005
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From: Earth
Either way, just about any vacuum secondary carb under 850cfm will work fine on a 300. Some just take more tuning than others...
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Junior User
Joined: Apr 2010
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From: Baltimore, MD
Well that is certainly good to know. Now i dont know if it makes a huge difference but I discovered the intake I have is a clifford intake and not the Offy C. I just remembered the single plane and thought it was the offy.
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Joined: Dec 2007
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From: Boise, Idaho
The Clifford is just generally more expensive, which is why people go with the Offenhausers. Your Clifford may have water jackets in it, which are nice to heat it up. Cut the return coolant line from the heater core in half and have one line go into the intake and the other line come out (instead of block, heater core, block, it'll go block, heater core, intake, block).
Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
Odd, I've used the primary boosters out of a 600 to rebuild an old 500cfm and the AFR came back exactly the same once I put a new 500 on later. Maybe it's on the secondary side? I reckon one of these days I'll have to put a couple side-by-side and break out the micrometer.
Either way, just about any vacuum secondary carb under 850cfm will work fine on a 300. Some just take more tuning than others...
Either way, just about any vacuum secondary carb under 850cfm will work fine on a 300. Some just take more tuning than others...