Carbureted LSX forum - who make summitracing carbs?
06-08-2012, 01:05 PM
who makes they're carbs and are they any good? they look just like a holley. i need a 750 with mechanical secondaries for my new 383.
06-08-2012, 01:07 PM
Probably a remanned holley, i would have no problem using one.
06-08-2012, 02:08 PM
I thought they were different, they split apart from the middle, like the whole top comes off.
Pop N Wood
06-08-2012, 02:24 PM
Holley made a 4010 carb that had the whole top split off like that. A buddy of mine has them on his boat.
From what I have read Summit took over making them. I don't know where or who they have making them. My guess the guys making them had egg rolls for lunch though.
Pretty good thread on them here (http://www.hotrodders.com/forum/holley-avenger-summit-carb-196299.html).
The Summit carb is a redo of the old Ford 4100 four barrel that came out about the same time as the Holley end bowl carb in 1957 to augment production rates that Holley couldn't keep up with. This thing became an Autolite and then Motorcraft item after Ford was forced by Federal court to divest its holdings in Autolite. It was used in production from 1957 through 1969 in several sizes on the Y block in 57, the FE's and MELs, and the Windsor engines through 69.
The version Holley made and sold, then Summit have had some modifications made since the Ford days such as centering the float pivot in the bowl, using an external fuel supply for the front and rear bowls, removing the secondary vacuum actuation diaphragm from integrated with the rear float bowl casting replacing it with a Holley style side mount. It retains the very nice removable annular booster cluster and the trash prone position of the main jets and power valve on the bottom of the float bowls. These use standard Holley parts just in a different position, unfortunately this position does collect junk that comes in with the fuel, but today's better filtration should cure much of that.
Here's some history the first picture at the bottom is the original 4100
Here's an article on the Holley version, he gets his history about this thing wrong.
It's actually a decent carb; many millions were out there in through the 1960's. From a hot rodders stand point it’s not as easy to work on as the Holley simply because the power valve is only accessible by removing the carb from the engine 'cause its housing is on the underside of the primary float bowl. For a racer this would be real PIA but for a set and forget street engine this is not a problem.
All-in-all, this is a decent carb that will do anything the equivalent Holley will do and with those annular boosters show a little better gas mileage doing it.
06-08-2012, 02:55 PM
Summit is a great place to buy from. I live next to the one in GA. I know that all the parts I have bought that where "Summit" labeled, where actually another brand. I don't want to say that's true about all there parts but from what I have seen and bought, it is.
06-08-2012, 08:50 PM
I was thinking of the summit replacements, sorry.
06-09-2012, 12:50 AM
this is the one i was looking at. i found used double pumpers from $200+ w/o shipping and i would have to rebuild just to be safe. also hope all the pieces are there lol. i mean $300 isnt a bad deal imo, especially when a new holley is alot more.
06-15-2012, 07:40 PM
Actually ran one of these when they were made by holley,one of the best carbs I ever used.ill be gettin one for my 3rd gen camaro.killer price too.
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