Thread: Tri-Power Carbs build.

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Disregard.

“…..So I should be able to richen up the center carb with the mixture screws? Or jets?....”

You should be able to richen it up with the idle screws, the jets have no effect on idle.

“…..If I drill holes in the butterflies to let in more air, isn't that leaning it out more? Is the center carb letting in so much fuel at an idle even with the leaking end carbs that it needs more air? What am I missing?.....”

I’m too lazy to type out the explanation, so here’s an article that pretty well explains it….I know it’s for a Holley 4 BBL, but the principal is the same.

Solve Idle Dilemmas without Misusing Throttle Plates: Car Engine


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I would not drill the butterflys if you're idling well on one carb (outers plated off). Sounds like you have another problem, I would check for a manifold vacuum leak. Perhaps on the oil valley side of the manifold.

Too late, drilled the butterflies a while ago. At first it wouldn't run at all. After backing out the mixture screws a bunch its not running too bad. I'm heading back down to tinker with it some more now.
http://youtu.be/QFvD01roBVQ

I do have a Mallory hyfire box that may or may not work that I was going to try at some point.