Quote Originally Posted by rspears View Post
Educate an old guy who never had anything that even hinted of needing 2x4's. With 3x2's or other multiples one carb runs the idle circuit, and the linkage is progressive, staging in the "secondary" carbs as you add more throttle. Do you set up 2x4's with a progressive linkage, so that it keeps the velocity up in one during idle and cruise, or are they both equally opened, both running idle circuits since the spacing might tend to overload one side of the engine a bit? I would imagine that trying to balance two sets of primaries to be right in the low to mid-range would be "interesting", as in potentially frustrating? Just wondering.....
Well.. I'll have to admit, I've never run this style! And actually, this is the only one I've ever seen! But, after looking at the idle screws it looks like they've been set about the same and the idle screws are also set about the same. So I'm assuming that both were intended to be operated at the same time. Also, this isn't or wasn't intended to be a street manifold! The carbs were set for racing and even the chokes were removed.

I know of one manifold currently used in Vintage racing, one of the members of SAAC runs it. He runs a Cobra 2 in 1 Air Cleaner housing, and it looks very different being mounted "crooked"...