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Old 05-09-2013, 11:32 AM
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Tri power,does it matter what kind of carbs?

Hello all,i want to put me together a tri power set up for a 327 or 350 im going to be getting the edelbrock intake for the carbs but my question is does it matter what kind of rochester carbs to get??? i know i need the ones that the fuel line needs to be on the side,i seen some rochesters with and with out chokes? but do i need to know anything else???? im also getting the kit for the carbs to make them work correct.THANKS

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Old 05-09-2013, 11:39 AM
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And do i use the small base or larger base rochester 2 barrel cars or thats just up to the person??
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Old 05-09-2013, 12:18 PM
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are you going to use progressive linkage? are you concerned about power or show?
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Old 05-09-2013, 12:36 PM
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Yes getting the linkage aswell,i want it for power/show
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Old 05-09-2013, 12:39 PM
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If you want power then buy new Holleys.
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Old 05-09-2013, 12:44 PM
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Well i want the rochesters just because i got a few i know i can get for dirt cheap just wanted to know is there a certain kind of rochesters to get?
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Old 05-09-2013, 12:54 PM
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If you are scabbing a set up together,just make sure the outside 2 carbs are the same.Home made set ups have been around a long time
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Old 05-09-2013, 01:18 PM
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My best advice is to begin reading links and finding out how to do it properly....
Tri-Power Carbs build.
Tri power rochester end carbs once and for all - THE H.A.M.B.
Rochester Tri-Power Tunnig Secrets - Hot Rod Magazine
Rochester Tri-Power Base Kit with Linkage - Speedway Motors, America's Oldest Speed Shop
http://static.speedwaymotors.com/pdf/910-11589.pdf
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Old 05-09-2013, 01:54 PM
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The center carburetor for the tri-power can be a Rochester 2GC (C=choke) and the outer carburators are Rochester 2G (without a choke or idling system) . You can get a Rochester 2GC for a 1969 Pontiac 350 V8 and it is identical to the 1966 Pontiac GTO Tri-power center carburetor.

The problem is finding the Rochester 2G front and rear carburetors that have no chokes or idling system. If you can find them, be prepared to pay big bucks for them.

It would be better to use Holley tri-power carburetors, if you can find a intake manifold that they will fit.

Get a dual 4-barrel set up and use two 600 CFM AFB carbs or two Holley #4224 660 CFM "center-squirter" carburetors. They are still available. The tri-power is just for the "wow" effect when you open the hood.

I had two Holley #4224 660 CFM carburetors on a Offenhauser manifold with two adapter plates. That set up was on a 1970 455 Pontiac engine in a '55 Chevy 2-door sedan. The engine ran and idled off all eight barrels with straight linkage. You can run straight linkage two Holley #4224 center-squirter carburetors. Best set up I have ever had.
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Old 05-09-2013, 02:22 PM
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SO GET A CHOKE CARB FOR THE MIDDLE AND NON CHOKE FOR THE OUTER, BUT I SWEAR THEY HAVE A KIT THAT MAKES ANY OUTER CARB NON MATCHED TO CONVERT THEM TO WORK ALL TOGETHER?????
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Old 05-09-2013, 02:27 PM
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SEE HERES 2 I CAN GET NOW 1 WITH CHOKE THE OTHER WITH OUT JUST NEED TO GET ANOTHER 1 WITH OUT THE CHOKE
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Old 05-09-2013, 02:30 PM
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THANKS MY FRIEND,I WILL READ ON THESE TONITE
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Old 05-09-2013, 02:42 PM
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Ok this the kit i was talking about,so if i bought this kit does it still matter if the middle carb is choke and outers are not choke ones????http://www.speedwaymotors.com/Roches...age,41655.html
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Old 05-09-2013, 03:58 PM
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The small base Rochester 2G carburetors are extremely rare and nearly impossible to find in a auto salvage yard. You could spend a lifetime looking for those.

The last time the small base 2-barrel carburetors were used was 1961-1965 Pontiac tri-power and 1961-1965 GM single 2-barrel Pontiac 389 V8 E-engines (Economy Engines). In the last 20 years browsing through salvage yards, I have only found one 1962 Pontiac with a optional 389 V8 E-engine.

The front and rear carburetors on a properly designed tri-power set up do not need chokes because you do not start and idle the engine from those carburetors. The center carburetor requires a choke and idle system and progressive linkage.

Last edited by MouseFink; 05-09-2013 at 04:03 PM.
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Old 05-09-2013, 08:20 PM
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Speedway motors And Jegs sell a kit to change two end carbs to correct setup ,They come with 2 new bases for end carbs without mixture screws they use jets as the original since they work at WOT also comes with rebuild kits for all three 3 carbs with CORRECT jets they also have linkage ,fuel blocks, and air filters avalible floats and gaskets with detailed instructions Also remove chohe rods and butterfly flapper tap the holes where shaft went thru and locktite a set screw to keep dust out .

Note some Pontiacs used a different size carb in center as compared to end,different size mounting holes and throat ,
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