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Carb Swap Questions: Edelbrock to Summit

2661 Views 84 Replies 19 Participants Last post by  swooshdave
When going from an Edelbrock 1406 to a Summit 600 will the Summit bolt right on? Are the bolt patterns and such all the same? Hoping to place one order and not several. Thanks!

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Discussion Starter · #22 ·
That must be a record. I've heard of having an additional filter but never more than 2. Sounds like you need a new fuel tank.
Tank is new. There's a plastic filter (1) that I need to remove that is in front on the fuel pump. The old fuel pump was the newer style that didn't have a filter. I replaced it with the old style with the filter. (2) Then there's a inline filter (Edelbrock) just before the carb (3) and then there is a filter in the carb (4).

I will remove the plastic filter and potentially the Edelbrock filter.
 

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I’ve run both on my 66. A used unrebuilt 600 Edelbrock and a new Summit 600. My back to back are pretty close. I will say the Summit seemed to be slightly smoother but not a night and day difference. I went back to my old Edelbrock primarily I had a rod and jet kit while I didn’t for the Summit and it was around $100. I forget whether it was going lean or rich at part throttle.

If you buy the Summit I’d highly suggest going through it before using it. It’s not as nicely made as the Edelbrock. Inside the boosters were a lot of burrs not removed from drilling. Jet markings are poorly stamped as well. Don’t get me wrong, they’re nice but I feel there’s more to be had with performance by going through it and detailing it.

If I was going out to buy a new carb, for me it would be the Edelbrock AVS with annular boosters.
 

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Discussion Starter · #24 ·
I’ve run both on my 66. A used unrebuilt 600 Edelbrock and a new Summit 600. My back to back are pretty close. I will say the Summit seemed to be slightly smoother but not a night and day difference. I went back to my old Edelbrock primarily I had a rod and jet kit while I didn’t for the Summit and it was around $100. I forget whether it was going lean or rich at part throttle.

If you buy the Summit I’d highly suggest going through it before using it. It’s not as nicely made as the Edelbrock. Inside the boosters were a lot of burrs not removed from drilling. Jet markings are poorly stamped as well. Don’t get me wrong, they’re nice but I feel there’s more to be had with performance by going through it and detailing it.

If I was going out to buy a new carb, for me it would be the Edelbrock AVS with annular boosters.
I will definitely give it a good inspection when it arrives. Not sure if the quality has gone up or down since you had one. The price certainly has gone up.

You can get a Summit jetting kit for about $55. The same Holley kit is $100.

What I like about the Summit is it shares some DNA with the old Ford carb. Does that mean anything? Probably not.
 

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I’ve run both on my 66. A used unrebuilt 600 Edelbrock and a new Summit 600. My back to back are pretty close. I will say the Summit seemed to be slightly smoother but not a night and day difference. I went back to my old Edelbrock primarily I had a rod and jet kit while I didn’t for the Summit and it was around $100. I forget whether it was going lean or rich at part throttle.

If you buy the Summit I’d highly suggest going through it before using it. It’s not as nicely made as the Edelbrock. Inside the boosters were a lot of burrs not removed from drilling. Jet markings are poorly stamped as well. Don’t get me wrong, they’re nice but I feel there’s more to be had with performance by going through it and detailing it.

If I was going out to buy a new carb, for me it would be the Edelbrock AVS with annular boosters.
I've also run both and ended up with the Edelbrock. The Summit carb I had seemed to suffer from QC issues and Idled at 1000rpm with the screw all the way out. I never did figure out what was wrong with it but suspect it had an internal vacuum leak. Other than the idle issue it was a smooth and responsive carb but pulling up to stop lights at 1000 RPM was maddening. I ended up with the AVS2 Edelbrock carb with annular boostersa and was very happy with it. Bought the tune up kit, dialed it in and never looked back.
 
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Discussion Starter · #26 ·
I've also run both and ended up with the Edelbrock. The Summit carb I had seemed to suffer from QC issues and Idled at 1000rpm with the screw all the way out. I never did figure out what was wrong with it but suspect it had an internal vacuum leak. Other than the idle issue it was a smooth and responsive carb but pulling up to stop lights at 1000 RPM was maddening. I ended up with the AVS2 Edelbrock carb with annular boostersa and was very happy with it. Bought the tune up kit, dialed it in and never looked back.
My Edelbrock 1406 won't idle correctly. It acts like it has a worn shaft bushing or something. I set the idle it to 650 or so and it wants to idle to 900-1000 when I come to a stop. If I lightly blip it will come down to 650. Something is not right.

The Summit carb was built to a price point. I'll post pictures if I find any defects or issues.
 

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Discussion Starter · #27 ·
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Carb came today. Along with carb studs and valve cover studs.

I gave it a once over and didn’t find anything amiss. When they decked the body it’s like the cutter isn’t wide enough. Should cause any issues but it’s not perfect. The casting where the air cleaner sits isn’t perfect either. I think there should be a gasket there?

I took it apart. Don’t like you have to take the choke off to take the top off. But at least your choke linkage can’t fall off.

But I haven’t found anything that makes me want to send it back yet.
 

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Discussion Starter · #28 ·
The hard line they included was ok but I’d need to change some things around. I ordered this other fuel line as I think it will fit even better.




I also ordered a jet kit in case I need to tweak it.
 

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The hard line they included was ok but I’d need to change some things around. I ordered this other fuel line as I think it will fit even better.




I also ordered a jet kit in case I need to tweak it.
Do NOT use teflon tape or sealer on the threads. For the AN fittings, torque them several times off the carburetor; don’t over-torque them, but put a little grunt on them. That seats them into one another without putting any load on the carburetor body itself. AN fittings don’t require much torque for service so don’t get carried away on final assembly.

If you want to keep from dinging up your shiny new fittings, line some crescent wrench jaws with electrical tape 😉
 

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Discussion Starter · #30 ·
Do NOT use teflon tape or sealer on the threads. For the AN fittings, torque them several times off the carburetor; don’t over-torque them, but put a little grunt on them. That seats them into one another without putting any load on the carburetor body itself. AN fittings don’t require much torque for service so don’t get carried away on final assembly.

If you want to keep from dinging up your shiny new fittings, line some crescent wrench jaws with electrical tape 😉
I think you can get fancy aluminum AN wrenches. For a part that will spend a majority of its life buried under the air cleaner I’m not overly worried.
 

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I think you can get fancy aluminum AN wrenches. For a part that will spend a majority of its life buried under the air cleaner I’m not overly worried.
Yeah, I’ve been meaning to buy some AN wrenches. For about 20 years now 🤣
 

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Discussion Starter · #32 ·
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Can’t really have an Edelbrock air cleaner after the carb swap. This came with a 289 HiPo sticker too.

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New fuel line feed looks really nice. Of course it’s buried under the air cleaner.

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I really didn’t look at all the connectors. Going to try an extension next. Two more days of waiting.
 

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Discussion Starter · #33 ·
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Got the 6AN to 6AN adapter today. I’m not a fan of the heater hose routing but that’s for another day. The Progression distributor wants full vacuum so that’s the port nearest the choke. Other distributors may want ported vacuum which is on the other side of the PCV port.

So all buttoned up. Will try to fire it up on Saturday. Fire extinguisher ready. You’ll know if I didn’t get a line tight enough because you’ll hear my wife squeal.

Recommendations on how to start a dry carb? Just crank it over until the bowls fill?
 

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The Progression distributor wants full vacuum so that’s the port nearest the choke. Other distributors may want ported vacuum which is on the other side of the PCV port.

Recommendations on how to start a dry carb? Just crank it over until the bowls fill?
The Progression is reading manifold vacuum to calculate load on the engine. Hook that thing up to ported and it'll do some seriously wacky stuff.

Swing down to Wally World and grab a squeeze bottle or two. Pre-fill the bowl with fuel and it should light right off.

Mainstays 12 Ounce Plastic Squeeze Dispense Bottle - Walmart.com
 

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Discussion Starter · #36 ·
I used a remote starter (key off) to check for leaks. Had to tighten up a lot of the fittings. Then went to start since bowls were full and nothing, no start. Battery is tired so I put it on the charger and will try again.
 

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Discussion Starter · #37 ·
Ok, got it started. I had to stretch the vacuum hose to the distributor and I think that kinked the hose. Once I swapped that out with a longer hose it started right up. Go figure.

Fast idle was way too high (2200) and the fast idle screw is comically hard to adjust. Then when it warmed up it wouldn’t idle below 1000.

I had heard of this happening before. The spacer they provide is… crude. I suspect air is leaking under the carb.

I decided to pull the carb and look it over again. That led to a bunch of drama when I couldn’t find one of the washers. I feared the worse, that it had fallen down the intake. Lots of searching until I wandered outside in the dark and found it where I had turned the carb upside down to drain the gas.

Anyways, I didn’t like the way the primary butterflies were sitting so I loosened the screws and resat them. I looked over things carefully and the fast idle screw had a crooked tip.

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Not sure if it apparent in the photo. I filed it flat.

I’ll get the carb back on and hopefully get the idle down. I’m going to try a light coat of sealant on the spacer. Hopefully that does the trick. I might also read the instructions and see what it should be torqued down to.
 

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Was there a reason you chose the summit over the Edelbrock AVS2? I recently went with the AVS2 with the annular boosters and I like it quite a bit. The Summit carb looks great and the new fuel lines look good as well. Hopefully its just a vacuum leak and you get it the idle down.
 

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My buddy said the same thing about the fast idle being particularly difficult to adjust on this carburetor. I guess maybe the base gasket could be leaking, but don't think he had any issue with that. Edelbrock makes a similar one that I have under my Edelbrock carb that would probably also work. Did you have that on your previous carb, maybe try it. I would not put any sealant on the carb base. Maybe it just wasn't snugged down enough.
 

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Discussion Starter · #40 ·
Was there a reason you chose the summit over the Edelbrock AVS2? I recently went with the AVS2 with the annular boosters and I like it quite a bit. The Summit carb looks great and the new fuel lines look good as well. Hopefully its just a vacuum leak and you get it the idle down.
I wanted to try something different. It’s not much of a change to go from the 1406 to the AVS. You do get the annular boosters and a slight change to the secondary but that’s about it.

With the Summit I get the center hung floats, I shouldn’t get the flooding from the vent under hard braking (even if there’s a workaround) and it doesn’t have the metering rods. Plus I like it has some DNA from the original Autolite.
 
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