Alright you guys on my truck I'm about to get a 4 barrel manifold for my 289 and deciding on carbs. Now I alreay own a 650 cfm edelbrock 1406. But I was debating on selling it and get a quadrajet for my truck. I'm considering the swap for a few reasons.

One reason was gas mileage. I was running a motorcraft 2 barrel for a while the got a Holley. I absoultly love the Holly but I saw about a 3 miles to the gallon drop. But I did pick up a half a second at the track.

Second reason is my engine is a little hot. I'm running a 289 HIPO with high compression 1968 302 heads putting my compression between 10:1 and 10.3:1 ish. I know I could run a 2 barrel on it but I want to be able to hear them ponies scream.

I like being different with a cool factor. Hence the reason I love dents, the reason I threw a 289 in and kept the 3 on the tree.


Now whats the pros and cons to each carb? Which give better mileage? Which gives more power? Which would be better on my combo?

Also what is required to drop a quadrajet on?

 

I have used both the Edelbrock and Quadrajet carbs on several different vehicles. My preference is the quadrajet all the way, for a couple of reasons.

Firsts the cons since in my opinion there is only one and this will serve as a warning. The Quad will take up quite a lot of time for the initial setup. Getting the unit rebuilt (there's an awesome link in this forum for it) is no small feat. and getting you initial jetting just right can be a bear, but....

NOW THE GOOD STUFF!!!!
those itty bitty primaries definitely save on the fuel bill. I have noticed anywhere from a 2- 8 MPG increase in economy in the various vehicles I've used them in. The 2 was in my '64 F100 SB (428,C6,4.11) the 8 was in a '71 F100 2wd (360, 4 spd., unk gearing)

You literally can't flood it out! I mean sure if you tried, but unlike the Eddy's when you're at the line and you start to wrap it up, the truck will ONLY pull what is needed it's vacuum driven so it is Soo much harder to flood out pre-run. And it doesn't matter what size of carb you get. I've currently got a 750 CFM (most common) on my 360. (fuel starvation under high performance is not a carb issue it's a delivery issue)

The smaller primaries also make for lots of fun just blipping the gas pedal. the response is so much faster!

And lastly The fuel bowl is in the middle of the unit so, for massive straight up drags, moderate off roading, and/or roundy round racing, you don't get the starvation you would from the Eddy, because of the angles or centrifugal force on the fuel in the bowl

 

How about an edelbrock quadrajet lol. Thats what im running on my 390 and i love it.

 

holley. the end.

 

Ya, I forgot that Edelbrock started making the quadrajet again! Mine have all been the Rochester.

 

Qjet.... One from a early 305 or so would be a good starting point..


Cliff Ruggels Book, Rebuild kits, and advice on his forum....

Cliffs High Performance Quadrajets :: Qjet Carburetor Rebuilding Book

 

street truck = Eddy

off-road rig = Q-jet

 

factory 289hipo had at least 10.5 comp not 10ish .. yea i bought a new boss crate motor from ford but it doesnt have the cleveland style head its got windsor heads on it so it still a boss right .........WRONG!

 

came with 10.5 comp . solid high duration mec cam bigger main bearing caps. an added counterweight to a higher nodu count crankshaft. and hypo heads had screw-in rocker studs. valve spring seating bosses. hay i dont know what u have but dought its a real k code

 

If you liked the original Motorcraft 2V you had, and the Holley 4V you replaced it with, I think you will be even happier with an Autolite 4100 carburetor.

The Autolite 4100 is basically a 4-barrel version of your original Motorcraft 2150, and that gives you all the driveability and reliability benefits the Motorcraft carburetor offered. The performance is very similar to the Holley, but fuel economy is even better. The Autolite 4100 can be had in either a 480cfm (1.08) or a 600cfm (1.12) size, and these are what actually came with the original 289 HI-PO motors in the 1960s.

 

I'm not for sure if my compression would be up to 10.5 because I don't know what the head CC was for the 289 heads. I do know the CC on my current heads are 53CC. So I went conservitive on what my ratio is.

It is a K code. It has the thicker main caps and counter weight. I don't have the original heads because I bought it with different heads. If you go to my build thread I explained the stuff that caused me to research the internet for K code specs. It came out of a mustang. Also it was a mechanical cam because I had to adjust the lash and I replaced it with a hydralic cam that I felt was more street friendly.

I wish I would of put a Holley 4 barrel on but I have a 350 CFM 2 barrel.


I'm leaning more towards the Q Jet now. Now will all has to be done throttle linkage wise to hook it up?

 

The 4100 is an underrated carb . It probably has the best atomization of fuel for any carb out there . No problems , No headaches . If your under 300 HP , this is the way to go .

 

im leaning towards going with a quadrajet for my mildly built 460(somewhere in ballpark of 400ish hp) should i go with a rochester or an edelbrock and what cfm(offroad/daily driver 4 speed 4x4