I have a 6x2 offy intake with 6 97's I'd like to run on a 283 with power pack heads. It will have progressive linkage, T5, 3:50r&p 750x16's. When I kick in the outer 4 carbs will that little motor just fall on it's face? The heads have I believe 1.74 intake valves. Thanks
Normal driving and freeway driving will only be using the two middle carbs (310 CFM), but when I stand on it around 3600 RPM and introduce the outer 4 carbs I'd like it to take off not fall over. All the pics I see from the late 50's are guys runnin 6 97's on 283's. Were they just for looks back then?
Do a search on some of Littleman's posts. He set up his 6x2's to drag and I think he shared some of his experiences. You bigest problem is going to be all the air you introduce into the intake when you open up the outer carbs. That is what will cause the bog. If you have enough gas to go with all that air you won't have a bog.
CHOTA...those heads were for 4 barrel carbs, if they are power pack heads. to run 6x2 carbs you will need a bigger cam, and fast flow exaust not to mention hotter spark. you question was will it fall on it's *** ( PROBABLY )...POP.
If it were me, I would use the outer carbs as dummies and just run the center carbs (Tell your buddies whatever you like.) The car will run clean, you won't be cleaning soot off of plugs (or changing them every 100 miles) and you won't be changing the oil every 300 miles due to fuel thinning. Had a tunnel ram 283 I drove daily (even in the midwest winter). Even having the back barrels locked out and just running on the front two barrels of each 4 barrel carb was too much fuel. Trust me, just run the center carbs and enjoy the hell out of the car.
He did mention that he has the power pack heads... I don't think I've ever seen a "domed" 283 piston.. Anyone have pics of those???
That lil 283 won't run with all those carbs..... You got no manifold vacuum when you romp on it. Run two with the rest dummies
They have always been just for looks unless they were on an engine that was built to run then. You can adjust your linkage so that they come in later or adjust so they don't come open as far or both. Your other option is to put blank flanges under some of the carbs. You'll still have the look without the hastle. If you want to run 6 carbs and actually have them be useful you have to build a 6 carb engine. Sorry but that's just the way it works.
There were thousands of 270 hp 283's made by Chevy.The 2 four barrels had about 780 cfm together I believe.Soild cam and typical Power Pac heads,right?
get ahold of ****ster27. he's knows his **** and can put you in the right direction. i have a 6x2 with 94's on a 283 w/ a hot cam in it. i tried using the outer 4 but couldn't get it running right so, now i'm running the center two. because of the cam and low vacuum, i ended up having problems with power valves so, maybe with your strombergs it will be different.
It can be done.......Even w/ straight linkage to boot...if you really want to put in the time and not give up. Engine mods will help the cause and do not need to be too crazy...a warmed over rebuild is all that is needed.........You could get it to work as is as well......Littleman
Here is a setup I did. It is a stock 283 with hot ignition and lake pipes. The center two are the runners, the outside four are dummied. I built the linkage to like progressive..This 283 runs great..Stock Stromberg 97s, .45 jets and .65 power valves.. Duane.
Some people forget that the 270 hp 283's ran on a 2 bbl (the primary barrels of the secondary (rear) carb for all low speed driving. After that the primary barrels of the front carb kicked in (via progressive linkage) followed by the secondaries of both carbs (via the linkage within each carb). So....................can everyone see the how it takes the dedication, patience and endless experimentation of a Littleman to get this combination to perform anywhere it potential. I'll bet there isn't 1 in a 100 HAMbers that have that talent OR dedication to get it right. BOTTOM LINE...................for the other 99%, run the center 2 and hope it will only take a few weeks to get it to run decent. Absent that a contact with someone like ****ster or one of the other carb gurus on the HAMB might be a shortcut. Frank
Why did they make the 6x2 manifolds if they don't work? I have one as well, and won't run dummy carbs. It'll be a wall hanger before I do that.
I don't think anyone said they won't work, they just said not with a stock motor with out a lot of tinkering.
I don't mind tinkering, and I'm not even trying to run straight linkage, I just want to tip in the outer 4 at higher RPM. Littleman has a built motor with 2.02's and higher compression than I do, but if he sais I can get it to work than I must try. There's just no other induction for me. Thanks for all the responses.
Hello..You'll never know until you try..Run the two center ones as primaries and the out side 4 as secondaries. I would use adjustable jets with .69 power valves..With the adjustable jets you can fine tune the 97s to the engine without having to swap out jets to get the right combination.. Do it.. Duane
If you're going to run straight linkage then the carburetors need all their circuits which complicates your tuning efforts. A simpler solution might be to run a richened up main metering circuit and accelerator pumps only (no idle or power enrichment circuits) in the end carburetors. GM did it this way on all the Rochester 3 X 2 setups offered by the factory. They also used thicker ****erflies in the end carburetors allowing them to seal tightly and not be as prone to sticking (I never had any of several Pontiac TriPowers hang open or stick). I believe Speedy Bill offers a TriPower conversion kit with progressive linkage and thicker end ****erflies. Two of these would be a good starting point. I'd run on the centers and run staged linkage to bring each end in one at a time. That way after you eliminate any and all air leaks, including those past supposed air tight secondary ****erflies, you can tune the centers to run clean and need only to educate your right foot as an air flow control device once it learns that matting the throttle is not the hot setup. Learning to read plugs is cheaper than buying a wide band O2 sensor for tuning by the way.
in a 283. you would not be able to run 2.02 valve head. cause the cyd walls are smaller, the largest would be 1.94's. good luck
I'm planning the same kind of project and if there are 6 carbs, sure as hell I'm going to try and make them work. My car 57 Ford Custom 300, 292, big valve 113 heads (1.92 in.) mild Clay Smith cam, Reds headers, T5 trans & 4:11 gear. Running a Edelbrock 3x2 now so I might have it half figured out. Still gathering parts for it and I plan to contact ****ster27 for alot of them and hopefully some advise.
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