What is the difference between single and dual plane intake manifolds?

If you check the RPM ranges on both you will see where they perform well. The dual plane intakes tend to idle better and run better at lower RPM's which is where most people need them to run well. The single plane intakes are hard to get to idle well and don't really start performing well until the RPM's are higher. For the most part they will shine mainly at the race track where you don't care much about fuel savings or having it idle well. I would be skepticle of running a single plane even on a stroker motor unless it has been built with a cam for high RPM's which isn't a very desireable traight in an off road vehicle.