I've got 2 Carter Competition Series 500 CFM carbs (real ones) on my DeSoto 291 with a 6-71 blower...everything new/rebuilt. I spaced the carbs tight together on the blower so that I can use a one piece Edelbrock/KN air filter. The carbs are so close together (bases touching) that I can't get a tool between them to adjust the idle mix on the rear carb. The carb linkage is progressive, and the rear will be the primary. In order to fire/break-in the engine, I closed off the idle mix /idle speed screws on the rear (primary) carb and ran just the front...the engine doesn't know the difference. Got it running/idleing fine...3 full turns out on each idle mix screw. Now, my question is, do I set BOTH carbs to the same idle screw (mix) setting, shut down the front carb and set just the rear carb to 3 turns out, or set BOTH carbs to 1 1/2 turns (idle mix screws) out? I hope you followed this...I had a hell of a time keeping it straight while typing it...
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