Carb tuning with wideband gauge

[rich weyand]

That's a good question about which side of the duals to put the sensor on. I think it could matter with a dual-plane manifold, because you are basically running half the carb on each side of the engine, but only if you don't tune both sides the same. Same rods, same jets, same pump shot, same idle screw settings (# of turns out), then it shouldn't matter.

Pay attention to the numbers in the previous responses here. Idle around 13.5-14.0. Why? Because a carb doesn't give a uniform mixture at low air flows, and any cylinder that goes above 17:1 will not fire. At cruise, 14.5 to 15, to get your best mileage. Power circuit, back to 13.5. And at WOT, 12.5.