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Old 09-03-2002, 09:03 AM
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Question Tri-Power fro SBC

I am building a SBC for use in a deuce roasdster. I want to use 3x2s. I have a Weiand manifold and I have put together 3 Rochester 2GCs, small base, to use on the manifold. I put the combo together and ran it on a 350 SBC test motor on a test stand to get it set up. It idles and runs fine but the front and rear carbs are bleeding air past the throttle plates. When I put my hand over the top of the carb there is quite a bit of suction and the motor stalls. I checked the bevel on the plates and they are in the right direction to close against the throttle bores. Years ago I had a similar problem with a factory 60 Eldorado 3x2 setup on a 57 Cadillac motor in a 52 Ford. At that time the plates were in upside down and would not close properly. This does not seem to be the case this time. the end carbs have the idle circuits blocked although they are not true "tripower" end carbs. Is this a normal condition or what. as I remember from my long ago Fordillac there was no leakage around the throttle plates. Any help is appreciated.

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Old 09-03-2002, 04:18 PM
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Rochester 2Gs not only require the idle circuits to be blocked on the end carbs they also require different butterflies. The end carb butterflies are thicker and actually have a slightly different angle. They're available from several different places but Hot Rod Tri-power and Vintage Speed come to mind right now.

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