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Carb Swap Questions: Edelbrock to Summit

2563 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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My friend just did this on his 68 with no issues, so I'd say you would be fine., since both are square bore carburetors. This really seems like a great carburetor and I like the idea of annular boosters. His car seem to run better than it ever has before and also has greatly reduced tailpipe odor. After seeing his first hand experience with that carburetor and reading some posts here about it, I have been tempted to do the same thing and swap out my 1806 with the SUM-M08600VS.
 

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If your engine is a 289 or 302, and it's mostly stock (even if it has an upgraded intake/headers), the 500 is an even better choice. Your engine just won't use 600 CFM unless you're putting it in under pressure. The 500 will have better throttle response and economy.

But if you have better heads/cam or plan to upgrade it in the future, the 600 will work pretty well on any of the Windsors too.

The M2008VS is a descendant of the Autolite 4100, but is easier to find parts for and tune these days. There's no better carburetor that I know of that's sized appropriately for these engines. I love 'em.
 

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Funny, just yesterday I was thinking we hadn't heard from swooshdave in a while. kip
 

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I run a Summit 600 CFM and I really like it. But I also ran an Edelbrock 600 for many years and I liked that carb as well.

What don't you like about your Edelbrock carburetor? It may simply require some tuning. A calibration kit is much cheaper than a new carburetor.
 

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Discussion Starter · #8 ·
If your engine is a 289 or 302, and it's mostly stock (even if it has an upgraded intake/headers), the 500 is an even better choice. Your engine just won't use 600 CFM unless you're putting it in under pressure. The 500 will have better throttle response and economy.

But if you have better heads/cam or plan to upgrade it in the future, the 600 will work pretty well on any of the Windsors too.

The M2008VS is a descendant of the Autolite 4100, but is easier to find parts for and tune these days. There's no better carburetor that I know of that's sized appropriately for these engines. I love 'em.
Headers, not stock cam (I was told by P.O.) and I may do heads in a while.

I believe the 600 has the annular boosters but the 500 doesn’t.
 

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Discussion Starter · #9 ·
Funny, just yesterday I was thinking we hadn't heard from swooshdave in a while. kip
Some people consider that a blessing. :p

I’ve not done anything to the Mustang as the weather has been… damp. And I’ve been working on a BMW for the kid’s first car.
 

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Discussion Starter · #10 ·
I run a Summit 600 CFM and I really like it. But I also ran an Edelbrock 600 for many years and I liked that carb as well.

What don't you like about your Edelbrock carburetor? It may simply require some tuning. A calibration kit is much cheaper than a new carburetor.
I’m pissed at it for stalling in the stop box at the autocross. A known problem with the Edelbrock. I tried the off-road float needles but it didn’t make a difference.

I’m not sure if it’s flooding or starving under the hard braking but either way it’s unacceptable to stall and not be able to move when you have a car behind you.

Plus if I can get a bit more response I’ll be happy.

Based on my AFR gauge I feel the Edelbrock is tuned pretty well and makes a really nice street carb. Hopefully the Summit performs better on the autocross track.
 

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Headers, not stock cam (I was told by P.O.) and I may do heads in a while.

I believe the 600 has the annular boosters but the 500 doesn’t.
The 500 has annular boosters too. All of the M2008 series do, as far as I know. It's listed on Summit's site accordingly: "Booster type: Annular"
 

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Discussion Starter · #12 ·
The 500 has annular boosters too. All of the M2008 series do, as far as I know. It's listed on Summit's site accordingly: "Booster type: Annular"
I’m not sure where I thought I saw that. Thanks.
 

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I’m pissed at it for stalling in the stop box at the autocross. A known problem with the Edelbrock. I tried the off-road float needles but it didn’t make a difference.

I’m not sure if it’s flooding or starving under the hard braking but either way it’s unacceptable to stall and not be able to move when you have a car behind you.

Plus if I can get a bit more response I’ll be happy.

Based on my AFR gauge I feel the Edelbrock is tuned pretty well and makes a really nice street carb. Hopefully the Summit performs better on the autocross track.
I’ve run both on my car. I would say the Summit seemed to feel slightly better if I had to pick something out between them but not earth shattering. I went back to the Edelbrock only because I have a tuning kit for it. The Summit I forget either was rich or lean at part throttle and a jet kit was like $100. What I was disappointed by theSummit is a lot of rough areas inside the boosters that were not deburred. I feel there’s a lot of room for improvement. Over all the Edelbrock is made and finished much nicer.
 

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Be sure your butterflies open freely, all the way to WOT, after its bolted down. Sometimes the butterflies will bind against gaskets or intake. Second, make sure you have all the linkage adapters to include a kick down for the tranny (depending on what you're running). You will need to re-config your fuel line setup, that also requires different fittings.

BTW, the stalling at the stop box is typically fuel flowing out the vent tube into the carb. Extend the vent tube with a short piece of hose, or connect the two vents and cut a small hole in the hose. This will keep the fuel from sloshing out the vents. Another option is pick up your idle to 900+.
 

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Discussion Starter · #15 ·
Be sure your butterflies open freely, all the way to WOT, after its bolted down. Sometimes the butterflies will bind against gaskets or intake. Second, make sure you have all the linkage adapters to include a kick down for the tranny (depending on what you're running). You will need to re-config your fuel line setup, that also requires different fittings.

BTW, the stalling at the stop box is typically fuel flowing out the vent tube into the carb. Extend the vent tube with a short piece of hose, or connect the two vents and cut a small hole in the hose. This will keep the fuel from sloshing out the vents. Another option is pick up your idle to 900+.
Transmission is in my sig. 5 speed so no worries about kick down.

I’ve got the hard line setup for the Edelbrock.
Be sure your butterflies open freely, all the way to WOT, after its bolted down. Sometimes the butterflies will bind against gaskets or intake. Second, make sure you have all the linkage adapters to include a kick down for the tranny (depending on what you're running). You will need to re-config your fuel line setup, that also requires different fittings.

BTW, the stalling at the stop box is typically fuel flowing out the vent tube into the carb. Extend the vent tube with a short piece of hose, or connect the two vents and cut a small hole in the hose. This will keep the fuel from sloshing out the vents. Another option is pick up your idle to 900+.
Great notes on the vent tube.

I think my fuel lines will work as long as the Edelbrock filter is 3/8
 

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Discussion Starter · #16 · (Edited)
You might want to check the length of the carburetor studs in the intake. The M2008VS comes with a phenolic spacer & I remember when I changed my Edelbrock 1405 to the Summit carb the carb studs were too short.
Any idea what length studs you went to?

According to Summit the base spacer is .25in thick. I’ll assume the flange thickness is the same or similar to the Edelbrock.
 

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Discussion Starter · #19 · (Edited)
I have the 2 1/4 inch studs in there. They maybe a bit long but it works for me.


Nice!

Vehicle Motor vehicle Automotive fuel system Gas Auto part


My current studs have about 1/4in or less showing. So I’ll probably need longer studs. But not much.

I have an in-line Edelbrock filter which is -6 AN so it should screw right into the Summit line.
 

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Discussion Starter · #20 ·
Carb ordered. Also got the ARP studs. And while I was ordering... ARP valve cover studs. Hopefully here this weekend. I think I'll need to short my fuel line if I want to keep my inline fuel filter. Right now there are four filters between the tank and the carb. That fuel going into the carb better be clean!
 
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