Hot Rods Dual Edelbrock carbs/Pregressive linkage/700R4 TV cable question

I'm putting dual Edelbrocks on the 354 Hemi I'm building, and I'll use progressive linkage on them. I'm still shopping for all the parts I need. The intake and carbs are easy. What I'm not sure of is the interface between the progressive linkage and the TV cable on the 700R4. That 700R4 TV cable is a mystery to me. Is there a certain linkage I should be looking for that mates up well with the TV cable? Are they even intertwined, or are they independent from each other? I was thinking of getting the Edelbrock progressive linkage setup. Is there a better one I should be looking at?

 

I just went through this and destroyed a brand new 700R4 in the process. Learning experience.

I used a basic throttle cable ***embly which seems to work fine. I used a basic universal adjustable 700R4 TV cable ***embly, which works fine, as long as you have the adjuster locked down and not loose like mine was. I have the progressive Edelbrock linkable on my carbs and I don't really like it TBH. The Lokar progressive dual quad linkage looks and works better. I had a SBC so I used a Edelbrock throttle cable bracket to mount the throttle cable and TV linkage. They are separate from each other. Make ABSOLUTE 100% SURE that TV Cable is adjusted properly or that trans will destroy itself before you get the car out of your driveway.

 

I would seriously consider running them one to one not progressive. That’s how I have them on my 383, works flawlessly

 

Dang, thanks for the heads up. I've sort of skim read about that cable, but I haven't really dug into it yet. It sure seemed confusing on the skim through, that's for sure. Knowing that they're seperate from each other helps, thanks for that. Can you elaborate a bit on ehat you liked and didn't on the edelbrock linkage vs. the Lokar?

 

Check out Bow Tie Overdrives online. They have great support, and can probably set you up with what you need.

 

My engine is only about 363 inches, and I think the dual 500 CFM carbs are probably on the big side as it is. I'm afraid that if I run them 1:1 direct, it might be way too much. I definitely want the look of the dual carbs, and I figured that if I ran them on a progressive linkage it would help with the possibility of being too much at once. The types of intake manifolds available for this engine are designed to mount and work much better with Carterbrock type carbs rather than Holleys, and the smallest carb of this type they make is a 500 CFM. Anyone have any thoughts on this progressive vs. 1:1 direct in my situation?

 

I'll check them out, thanks.

 

The Edelbrock linkage has more parts that have to be adjusted, set, and locked into place with a set screw than are probably necessary. Yes, it works, but since it attaches with Heim joints, it also has the ability to rotate. It's a little clunkier than it should be. The Lokar linkage is much more simplistic. It's a simple rod with an elongated portion to set how much you want the main carb to open before you start tugging on the front carb. The only beef I have with the Lokar is that the standard size was too long for my application, and needed to be cut off and rethreaded.

 

Here's a few pics of the throttle cable and TV linkage bracket, and the progressive linkage.

Remember that when you're setting up the TV linkage, you have to set the cable up where it is the proper radius off the centerline of the throttle shaft. If you're using Edelbrock carbs, they make a supplemental bracket to correct this geometry. Again, this is absolutely essential to set up the TV linkage on the 700R4.

 

As mentioned above, use the corrector tab/bracket for the Edelbrock carb and 700R4. Set it up on the primary carb. I have no input for the dual quad linkage, though.

 

Thanks Joe. Now I see what you mean, the E'brock linkage does look a bit clunky and over complicated. Now...completely off topic - love your air cleaners. What are they and where'd you get them? Never seen them before.

 

Thanks man, I think they're awesome, too. Spotlite Kustom has them

 

Thanks!

 

I think you may be surprised, remember that two 500 cfm carb’s doesn’t equal 1000cfm, I believe they behave like a single carb equal to about 75% of the combined cfm. Think 750 cfm

 

This is the carb throttle linkage geometry corrector for some Edelbrock carbs. Be sure to get the correct one for your primary carb.
https://www.jegs.com/i/JEGS/555/157301/10002/-1

 

I hope it's not too much. Only one way to tell. get it going and see.

 

The small Chevy that's in there now has an Edelbrock on it. I suppose it has all the bracketry and all that's needed for the TV cable on there already. I'm not home to look at it, but I'll have to get back and check it all out.

 

DO NOT ***UME!

It absolutely must have the geometry corrector for the TV cable on the bellcrank.

Run without it, and you risk destroying the transmission, almost as you can say whoopsie!

 

Don't go progressive , 1:1 is better in every way , it should not effect your mileage , throttle response will be far better , mixture will be balanced . That's my 60+ year take on experience with dual quads .

 

I'm ***uming as I sit here. Of course when I get back home I'll check and if not there I'll pick it up, along with whatever else I need to get it right.

 

That seems to be the prevailing opinion.

 

If you run progressive linkage, be sure to set up the 700R4 cable on the primary carb, and it will work. But you need to be positive the linkage on the carb has the correct ratio for a 700R4 trans to work properly! Not all carburetors are setup to the correct ratio for the 700, so check that out before ruining a trans. I know Holley sells a separate linkage arm that bolts to the stock arm on Holley carbs specifically to operate a 700R4 cable. I bought one for my Quick Fuel carb, and then when I went to bolt the adapter on I discovered my new Quick Fuel has the correct arm already.
If you're running some other carbs, you'll need to compare the ratio, and where the arm sits in relationship to the primary shaft to make sure it's all correct. Here's the adapter for the TV cable for an Edelbrock carb:
https://www.jegs.com/i/Edelbrock/350/8026/10002/-1
And here's the adapter for a Holley type carb:
https://www.holley.com/products/fuel_systems/carburetor_components/brackets_and_linkage/parts/20-121

 

I don’t use an auto trans with a TV cable but I’ve run my dual quads progressive for 7 years and wouldn’t have it any other way. I idle on both so some fuel is used from the front carb. I do “tickle” the throttle on most weekend use. In So Cal we don’t need to winterize much.