Everyone realizes the SUMMIT 4010 is CHI-COM?

I would imagine the new model is also.

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It's been reported in the past, by the company "Pony Carburetors," now unfortunately out of business due to the passing of the owner /manager & by former contributor to Y-Block magazine, Jerry Christenson, that testing of the Ford Autolite, 4 Bbl 1.08 & 1.12 carbs found them to be in many cases substantially more economical on fuel than other after market carbs such as Holleys.  Of course those carbs are no longer available new. although there are a couple of outfits that rebuild them, some are on the internet.  I have a 1.08 on my 57 car & while I haven't really had an oportunity to check  mileage accurately, it's a nice running carb. Better than the  2 Bbl Holley that was on the car when I bought it.  Even easy starting after sitting for long periods in cool weather. The one thing to keep in mind with those carbs is that due to their "annular" fuel discharge setup, a clean fuel filter is manditory to avoid problems..         


Paul

Here’s a picture of the Summit Max Performance carb.  It would appear that they are available only as double pumpers (mechanical secondaries) and currently only available in two sizes; 650 and 750 cfm.
  
 
And here’s a picture of the Summit 4010 carburetor made by Holley with Summit badging.  These are available in 500, 600, & 750 cfm models with vacuum secondaries and a 750 cfm model with mechanical secondaries.
 

Lorena, Texas (South of Waco)

The Max Performance looks to be a 4150 / 4160 style of carb.  The original Summit carb is basically the Holley 4010/4011 and these are similar in appearance to the Autolite / Motorcraft carbs,.


Lawrenceville, GA

Charley: Is that high performance carb based on the previous Holley 4010 carbs from some years back, that apparently never really caught on, for whatever reasons?.  If I have it right, that's a ??, the 4010 carb had the "annular" fuel discharge into the booster venturies that was similar to the Ford Autolite carbs that came out in 1957 & into the 60's & were used in early Mustangs etc.. 


Paul

I just saw in a Summit catalog that they have a "Max Performance" carburetor now, which is a more conventional Holley styled carb.  The price for those seems real good for the features included.


Lawrenceville, GA

As a note... the Summit 500 cfm are currently back ordered stating end of February for shipping. Seems like the HAMB and mentioning here might be increasing sales.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Ditto on the distributor comment.
 
The factory four barrel set ups are engineered combinations.  When arbitrarily just converting a 2V engine to a 4V set up using a universal carb, then some extra calibration will be required to make that compatible with the current engine combination.  I have experimented with a variety of 4V carbs on my 272 and after some tuning, most of them get a reliable 19+ mpg on the highway.  I have seen as high as 21 mpg.
 
The current carb is the Summit 500 cfm unit while the previous carb was the 525 cfm Road Demon Jr.  After eight plus years with the Demon carb, it needed a kit and rather than rebuild it, this was a good time to try the new Summit 500 carb.  The Summit carb has been on the car now for four years and runs good although it's just a bit on the small side when pushing the speed up there.  This car has been used in the Big Bend Open Road Race so it's not just a Sunday cruiser.  Before that Demon carb was a number of Holley and Carter carbs.  I was always at a loss with the Carter carbs in getting the fuel mileage I get with other carbs so I’m simply not a Carter/Edelbrock carb fan. Keep in mind that all this is with an engine that now has almost 200K miles on it since that last time it was opened up.  The car now has over 300K miles on it.

Lorena, Texas (South of Waco)

If you installed a modern carburetor with your original 1955 distributor, you went backwards not forwards.  Upgrade the distributor and you will see a noticeable difference.

Skyhunter: 1st of all we need to know what year your car or engine is ? '55-56 engines came with vacuum advance Distributors (no centrifcal advance) & carbs that were designed to work with them.. If you installed a 57 or later model carb on one of those engines with the original Distributor, that is why it's not working properly.. This is a  long standing problem going years back!  Unfortunately, Ford was out of step by 1956 with this setup.. Another unintended performance set back.. You need a 57-62  distributor to get started on the right foot..

N.B.- just noticed that the original starting posting here is 3 yrs old... 


Paul