Summit 600cfm 4v
 

I have finally had a chance to run my WILLYS truck around and begin fine tuning everything.I installed a brand new summit 600cfm 4V carburetor.A very simple carb like the Autolite 4100.I LOVE this carb!! its working flawlessly and EASY to adjust and while it will be awhile to see if its reliable and STAYS adjusted..im getting clean exhaust doesnt seem to be running rich.And im getting a solid 22mpg at 60mph..its a stock 1979 Ford 302/FMX ,Pertronix Ignitor,shorty headers,duals with glasspacks out the back.The rear axle gears ratio is 3.08..the tag indicates its supposed to be 2.79,But a quick check its actually 3.08.Anyways solid carb,simple,easy to adjust and it was just shy of $260.00 delivered to my door.Its not a Holley,which for me is a blessing.

Is this the abandoned holley 4010?

i wish sumitt would also reproduce the 4011 model as well.

summt 4v
 

From what i can learn the summit 4v is based on the holley 4010..why Holley abandoned it,i dont know except the people who bought it,Sais those 4010's sucked.I took apart my summit when i got it,And i also borrowed a friends 4010.they appear similar,However i also took apart one of my autolite 4100's.And the summit is alot closer to a 4100 than the holley is.Like you i can only wish that somebody would reproduce the Autolite 4100..Pony carbs has remanufactured 4100's at near $500!! sorry but i wont EVER pay that for an autolite.In my opinion,the summit is about as close as any of us Ford guys will get to a 'new' autolite.The summit does use holley parts,One thing that will NEVER happen and that pissed me off royally was if i was running a holley..if the engine so much as coughed or sputtred it would blow a power valve and dumped raw fuel into the engine.I think i made a good choice..i didnt like the idea of an Edelbrock,another holley,Demon etc..they all have too many moving parts in my opinion.The autolite was reliable because it was simple..and the summit is also simple

Another thing i like about these carbs is that they are fairly light.

been driving the truck for awhile now,I just adjusted the floats and jets for the first time.I really really really like this carb,I just pegged the mileage at 19.5mpg and thats at 65mph and alot of in town driving added.If its all in town it drops to about 15mpg or less.So im quite happy with the carburetor.throttle response is immediate,the acceleration is smooth.It really behaves as an Autolite 4100.im buying another one for the 1965 falcon wagon im doing for my daughter,And then i talked my son into buying one for his 72 maverick 302/C4.

My buddys dad install a 750 one on a hot 454 he had in a 78 malibu and it ran super right out of the box, I'm looking at the new street demon for my Lt1
Demon Carburetion Carburetors - Street Demon

i think im going to stick with the summit i bought,its simple and so far has been reliable,time will tell.its similar to the Autolite 4100 which i love,but the cores i have do not warrant rebuilds..not when there are the summits available.Besides the truck is a daily driver and i want to save the autolites for a car thats more for recreation and wont be driven everyday...and also i want to keep them out of circulation so PONY CARBS cant get them and charge $500 for a carburetor hahaha

i wish i would have purchased that too, instead of the edelJUNK carb that i got for about $160 from summit too. am about to put my old holley 600 back on. what a P.O.S.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!! (SEE my product review of same).

my brother wont run anything but an edelbrock 4bbl,I dont know why..but he can keep it tuned,running nicely,i tried one but i couldnt get it to tune...its too much like a 'quadraHOG.he hates the autolites,motorcrafts.But for some odd reason he loves that edelbrock and quadrajets...holleys are a close 2nd. yuukkk!! i will take this summit any day over those things

The Summit carb has several improvements that make it more tunable- like a separate replaceable accelerator pump shooter and removable bleeds. The Holley version had no way of changing the shooter size except to drill them out or replace the entire cluster at about $25 a pop (1992 price).

The Summit also has all the secondary vacuum cover screws accessible; the Holley had one screw hidden, making it harder than it should be to work w/the vacuum secondary spring, check ball, or diaphragm.

i like the summit because it behaves likes an autolite 4100,but has some improvements..i do like being able to adjust my floats without having to remove the top of the carb,i like the windows so you can see your fuel level,i do like that it uses holley parts..i know i say i dont like holley carbs...in general i do nor,But they do make excellent parts and pieces that are in this summit

I have encountered my first trouble with this summit four barrel.the power vlave or accelerator pump has failed..i think.I noticed the truck was running very rich and then my mileage dropped to 10-12mpg i was getting a good 15-18.Im looking for a rebuild kit but it appears that the rubber diaphrams are not part of the kit..dammit! years ago when you got a rebuild kit..you got EVERYTHING that was a 'moving part'. I dont want to rebuild the entire carburetor it only has 6 or 7 thousand miles on it.I was told that these summit carbs use 'Holley' parts.Is this true? And i also would like to jet down a hair if i could.

Replace the power valve w/a Holley part. A '65' is the 'go-to' size for mild engines, if you have a big cam you may need to go to a smaller number so the enrichment doesn't come in too soon. Details of the engine and vehicle will help here.

The accelerator pump won't make it run rich. As long as you're getting a good stream from the shooters at the hit of the throttle and you have a tiny bit of free play at WOT the accelerator pump adjustment is OK. It might need a bit of tuning if you're looking for the best possible mileage, though.

BTW, you can use Holley jets, too.;)

Im not entirely sure what the problem is,But when the engine is off,And i actuate the carburetor..the fuel rolls out and dribbles ALOT rather than 2 seperate and fine streams..i know its not supposed to dribble.

Look to see if the check valve under the shooter is clogged w/something. The red umbrella check valve under the accelerator pump diaphragm should be checked if that doesn't help. If the diaphragm itself is ruptured it'll leak fuel from the pump cover.