I was wondering if anyone has tried the Summit Racing new Carb.

I know it is a 600 cfm carb, and that might be too large for some (many) of the 300 owners, but I was looking for some feedback.

I've been reading some reviews, how it is a blend of the Holley 4010 and the Autolite 4100. I am entrigued.

As with so many parts, they are designed for the v8 crowd.

 

If it's the one I'm thinking of it's a remake/re-branding of a Holley carb that really didn't take off for whatever reasons/excuses.

 

Does it have smaller primaries than it does secondaries? I have been looking into the Street Demon real hard, but the summit carb is a hundred dollars cheaper.

 

I've had a Holley 4011? for 20 years. My favorite by far.
750cfm, spreadbore, mechanical secondary.
Summit is an improved copy of the Holley but I think only available in vacuum secondary and squarebore.
Inlet ports are angled to allow better air filter installs too.
Holley is aluminum, don't know about the Summit.

Holley out of the box was pig rich at idle and the bleeds had to be drilled out, carefully since they are part of the casting and no room to resize and plug.
If I were in the market for a new carb, I would get the Summit.

 

I've been really interested in getting one of these carbs and trying it out, but haven't as of yet.

One thing I did see was a writeup that someone did about what needs to be done to the carb once it's purchased. They said it was a good carb, but there was a reason for the low price tag. Easy things, such as removing a little casting flashing, polishing out cast lines, etc. but made it go from a good to a great carb.

Trying one is on my "to do" list.

 

I know I'd like to try a Barry grant or "demon" carb. Their road demon jr. Has a 525 cfm unit

 

i don't have one yet, but it'll be the next carb i buy.
basically- its an Autolite 4100 that uses Holley parts.

what could be better?

 

No, it is a square bore. Primaries and secondaries are the same size.

What caught my attention, while reading the review that ABANDONEDBRONCO mentioned, was that the boosters are identical and interchangeable with an Autolite 4100, and that means 'annular discharge', which is so highly regarded on that carb. With the air horn removed I thought it was a 4100.

But they also designed some Holley features into the carb (I guess it is the Holley 4010, born from the Autolite 4100, Holley paying Ford for use annular fuel discharge design, redesigned with fuel inlets angled downward): Float level 'windows', floats adjusted from exterior. They also moved the secondary diaphragm from the end of the carb to the side, like on most Holley's. (On the 4100 it stands vertically in a housing sticking out in front of the secondary bowl. On this carb it sits horizontally beside secondary bowl.

It seems to be a rumor that the Summit carb is actually made by Holley. And, from what I gathered from the review, Summit is suspiciously vague about where the carb is manufactured.

All in all, I can't argue with the price: on sale now at Summit for $233!! If it wasn't 600 cfm I'd grab one. A person usually pays close to $200 for a rebuilt 4100 with the smaller venturi on ebay anyway, for a carburetor that has been tweeked and worked on by an untold number of 'mechanics' for 40+ years.

Oh, how sweet if they made a 450 cfm model....

 

I'm with ya f250. I like Holleys..I use Edelbrock cuz it seems I can tune it easier. All the talk of powervalves ale air horns..I have NO idea haha but it seems that when tuned Holleys perform better and operate smoothly

 

I've been running the summit carb for about six months now. I'm not to crazy about it. I can never get the electric choke to go off in a timely manner. Even on a hot day. Hell I can drive it for an hour shut it off crank it up again and still have to wait for the choke to go off

 

Is that the only issue you have with it? How's the drivability? Gas mileage?

 

Yea that's the only issue. Gas mileage is great with it. I figured about 18 on the hwy. I check voltage on it and it was good. I've tried adjusting the choke with no luck. But I will put it back on as soon as the motor gets back from the machine shop.