Replacement Carb Question/Opinions

[bajajoaquin]

As mentioned in another post, the carb on my '67 Imperial seems to leak occasionally. I suspect sticky floats.

However, I just looked up the numbers stamped on the air horn, and found out it's a 600CFM vacuum-secondary, manual choke carb. Factory original is a Holley 4160 750CFM carb, with an automatic choke.

The throttle linkage feels stiff, and there's a big stack of washers to shim the throttle rod. I don't know why one of the previous owners rigged it up like this, but he did. In addition to the stiff linkage, I'm also a little unhappy with the kickdown and shifting adjustment. I'm wondering if the rigging has had an effect on this, as well.

Anyway, because it's a 600, I'm leaning more and more to just replacing the carb rather than trying to mess with it much.

Here are my options:

Holley
New 4160, "Universal" throttle linkage, about $320 from Summit
Rebuilt 4160, about $300 from Rock Auto; Might have proper linkage, it's not clear

Summit Racing carb, new $385, reman, $325. Universal linkage

Edelbrock Performer carb, $350 new, $290 reman from Summit.

I have no idea what other changes were made to linkages over the years. But my goal is to have it bolt on as easily as possible, and be as simple to tune and reliable as possible. Ultimately, I'm going to have to rebuild this engine, but any of these has plenty of flow for the mild upgrades I'd do. So it really comes down to what will work best with the least fiddling.

I'm kind of leaning towards the reman factory carb based on the idea that it should bolt on with the fewest problems, followed by the new Holley.

Thoughts? Opinions?

 

[Fratzog]

This is the carb on the 440 in my Monaco 500. Runs well and easy to work on.
http://www.edelbrock.com/automotive_new/mc/carbs_acc/pdf/carb_owners_manual.pdf

 

[bajajoaquin]

How directly did it bolt on? Any linkages need changing?

 

[Fratzog]

Direct bolt on since it sits on a Eddy Performer intake. Mechanic installed the carb after 440 rebuilt so I'm unsure what was done.

 

[1978 NYB]

I would go with an Edelbrock 1411 (750 CFM) with an electric choke. You'll need a linkage adapter. Are you using a stock manifold? If yes, you'll need the proper adapter adapter plate with a stock or a Eddie manifold.

If you go on AAP and order on line (and pick up at the store or have it delivered to your house) you could save 20 - 30 percent depending on the offers that change constantly. I didn't read the fine print if the offer is good for Edelbrock products.

 

[1978 NYB]

 

[commando1]

Bob, after all this time you still haven't got the cruise cable hooked up properly???

 

[1978 NYB]

Bob, after all this time you still haven't got the cruise cable hooked up properly???

Again.....old pictures.

 

[Wollfen]

Bob, after all this time you still haven't got the cruise cable hooked up properly???

Ahh, i was wondering what i was seeing.

 

[1978 NYB]

I still haven't taken any new pictures with a decent back drop with the road wheels on.....it's been a year.

Soon......

 

[Mr C]

Have you thought of rebuilding the carb you have? It's another option.

 

[bajajoaquin]

Have you thought of rebuilding the carb you have? It's another option.

It's the incorrect carb in a number of ways: it's 600cfm, stock is 750, it has a manual choke, the linkage is rigged up with a 1-inch stack of washers. I could rebuild it, but I would spend a bunch of time I don't have and still want to put on the proper piece of equipment.

 

[bajajoaquin]

.... Are you using a stock manifold? If yes, you'll need the proper adapter adapter plate with a stock or a Eddie manifold.....

Based on the conversation in my carb pad height thread, I may be staying stock.

Do you know what the adapter plate is? I didn't see one in the intallation accessories on the Edelbrock website, and they're closed for the holidays, so nobody on the phones, either. The closest adapter I see is for an application that, "Mounts Edelbrock square-bore carbs to stock Quadrajet & Thermo-Quad manifolds." My Imperial came with a Holley square-bore carb, not a Quadrajet or Thermo-Quad.

 

[70bigblockdodge]

Eddy carb will direct bolt to your stock intake, I still think eddy 800cfm thunder series is a good choice.

 

[1978 NYB]

Eddy carb will direct bolt to your stock intake, I still think eddy 800cfm thunder series is a good choice.

Let me begin with I've used Eddie intakes with Eddie or Holley carbs on numerous projects during the last 40 years.

I called the Eddie tech line and you DO NEED the adapter to bolt an Eddie to a Thermoquad stock intake.

You need Eddie adapter 2696...

If you are bolting an Eddie carb to an Eddie performer intake you need this Eddie adapter 2732...because the performer intake is a spread bore intake. This adapter comes in the performer intake box.

I would assume you don't need an adapter if you are bolting an Eddie square bore carb on to a stock square bore manifold.

Here's the link to the Eddie adapters...

http://www.edelbrock.com/automotive_new/mc/install_items/adapters_spacers.shtml

It wouldn't hurt to call the Eddie Tech Line......

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[TD]Edelbrock, LLC Headquarters
2700 California Street, Torrance, CA 90503
Phone: 310-781-2222
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Tech Line Only: 800-416-8628
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[1978 NYB]

Note.....

I have an Edelbrock Performer intake, Eddie carb, and a 14"x2" Eddie aluminum air cleaner assembly and a 1/2" spacer on top of the carb (the air cleaner hits the choke assembly without the spacer) on my 1978 NYB with a 400. The 2732 carb adapter I used is about 3/16" thick and I still have about 1.5" clearance to the hood when the hood was closed. I also have the hood insulator pad mounted too.

How do I know that???

I made a 3" ball out of foil and sat it on top of the center of the air cleaner and closed the hood. I measured the foil ball after it was crushed and had 1.5".

I don't know how much room you would have with your Imp. You can probably figure out the height and stack a couple piece of wood or something and use the foil ball test to figure your clearance height.

 

[commando1]

Bob is our Edelbrock carburetor conversion Technical Support ace here.

 

[1978 NYB]

If you go with the Eddie carb...you'll also need an Eddie linkage adapter.

 

[bajajoaquin]

I found a guy locally who retails them and deals only in carbs. Buying one through him is about $30 more expensive than ordering online, but every now and then you gotta support local business. I'm assuming that his "ready to bolt-on" price includes the proper adapters, but I'll make sure before I actually purchase.

I think the Performer intake is going to be a later addition. I just updated my spreadsheet and found that I have $700 left in my budget, and I'm sure something else will crop up, and I want to have a few bucks left over to cover that.

 

[1978 NYB]

FYI, you'll need throttle linkage adapter Eddie #1481.

http://www.edelbrock.com/automotive_new/mc/carbs_acc/access_throttle.shtml